diff --git a/src/plugins/analyzerbase/analyzeroptionspage.cpp b/src/plugins/analyzerbase/analyzeroptionspage.cpp
index 6acbf3d96d9..4a56396b49a 100644
--- a/src/plugins/analyzerbase/analyzeroptionspage.cpp
+++ b/src/plugins/analyzerbase/analyzeroptionspage.cpp
@@ -48,7 +48,7 @@ AnalyzerOptionsPage::AnalyzerOptionsPage(AbstractAnalyzerSubConfig *config, QObj
 {
     setId(m_config->id());
     setDisplayName(m_config->displayName());
-    setCategory(QLatin1String("T.Analyzer"));
+    setCategory("T.Analyzer");
     setDisplayCategory(QCoreApplication::translate("Analyzer", "Analyzer"));
     setCategoryIcon(QLatin1String(":/images/analyzer_category.png"));
 }
diff --git a/src/plugins/android/androidsettingspage.cpp b/src/plugins/android/androidsettingspage.cpp
index 3e5adcdb17d..4e44921c65f 100644
--- a/src/plugins/android/androidsettingspage.cpp
+++ b/src/plugins/android/androidsettingspage.cpp
@@ -42,7 +42,7 @@ AndroidSettingsPage::AndroidSettingsPage(QObject *parent)
 {
     setId(QLatin1String(Constants::ANDROID_SETTINGS_ID));
     setDisplayName(tr("Android Configurations"));
-    setCategory(QLatin1String(Constants::ANDROID_SETTINGS_CATEGORY));
+    setCategory(Constants::ANDROID_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Android",
         Constants::ANDROID_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::ANDROID_SETTINGS_CATEGORY_ICON));
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp b/src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp
index f29a6498521..872d80047b7 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp
@@ -245,7 +245,7 @@ CMakeSettingsPage::CMakeSettingsPage()
 {
     setId(QLatin1String("Z.CMake"));
     setDisplayName(tr("CMake"));
-    setCategory(QLatin1String(ProjectExplorer::Constants::PROJECTEXPLORER_SETTINGS_CATEGORY));
+    setCategory(ProjectExplorer::Constants::PROJECTEXPLORER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("ProjectExplorer",
        ProjectExplorer::Constants::PROJECTEXPLORER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(ProjectExplorer::Constants::PROJECTEXPLORER_SETTINGS_CATEGORY_ICON));
diff --git a/src/plugins/coreplugin/dialogs/ioptionspage.h b/src/plugins/coreplugin/dialogs/ioptionspage.h
index c82b2244a4a..ed3d1a5886f 100644
--- a/src/plugins/coreplugin/dialogs/ioptionspage.h
+++ b/src/plugins/coreplugin/dialogs/ioptionspage.h
@@ -30,7 +30,7 @@
 #ifndef IOPTIONSPAGE_H
 #define IOPTIONSPAGE_H
 
-#include <coreplugin/core_global.h>
+#include <coreplugin/id.h>
 
 #include <QIcon>
 #include <QObject>
@@ -46,7 +46,7 @@ public:
 
     QString id() const { return m_id; }
     QString displayName() const { return m_displayName; }
-    QString category() const { return m_category; }
+    Core::Id category() const { return m_category; }
     QString displayCategory() const { return m_displayCategory; }
     QIcon categoryIcon() const { return QIcon(m_categoryIcon); }
 
@@ -58,13 +58,13 @@ public:
 protected:
     void setId(const QString &id) { m_id = id; }
     void setDisplayName(const QString &displayName) { m_displayName = displayName; }
-    void setCategory(const QString &category) { m_category = category; }
+    void setCategory(Id category) { m_category = category; }
     void setDisplayCategory(const QString &displayCategory) { m_displayCategory = displayCategory; }
     void setCategoryIcon(const QString &categoryIcon) { m_categoryIcon = categoryIcon; }
 
     QString m_id;
     QString m_displayName;
-    QString m_category;
+    Core::Id m_category;
     QString m_displayCategory;
     QString m_categoryIcon;
 };
@@ -84,18 +84,18 @@ class CORE_EXPORT IOptionsPageProvider : public QObject
 public:
     IOptionsPageProvider(QObject *parent = 0) : QObject(parent) {}
 
-    QString category() const { return m_category; }
+    Core::Id category() const { return m_category; }
     QString displayCategory() const { return m_displayCategory; }
     QIcon categoryIcon() const { return QIcon(m_categoryIcon); }
 
     virtual QList<IOptionsPage *> pages() const = 0;
 
 protected:
-    void setCategory(const QString &category) { m_category = category; }
+    void setCategory(Core::Id category) { m_category = category; }
     void setDisplayCategory(const QString &displayCategory) { m_displayCategory = displayCategory; }
     void setCategoryIcon(const QString &categoryIcon) { m_categoryIcon = categoryIcon; }
 
-    QString m_category;
+    Core::Id m_category;
     QString m_displayCategory;
     QString m_categoryIcon;
 };
diff --git a/src/plugins/coreplugin/dialogs/settingsdialog.cpp b/src/plugins/coreplugin/dialogs/settingsdialog.cpp
index c88b3594535..518752a9f4f 100644
--- a/src/plugins/coreplugin/dialogs/settingsdialog.cpp
+++ b/src/plugins/coreplugin/dialogs/settingsdialog.cpp
@@ -69,9 +69,10 @@ static QPointer<SettingsDialog> m_instance = 0;
 
 // ----------- Category model
 
-class Category {
+class Category
+{
 public:
-    QString id;
+    Id id;
     QString displayName;
     QIcon icon;
     QList<IOptionsPage *> pages;
@@ -94,7 +95,7 @@ public:
     const QList<Category*> &categories() const { return m_categories; }
 
 private:
-    Category *findCategoryById(const QString &id);
+    Category *findCategoryById(Id id);
 
     QList<Category*> m_categories;
     QIcon m_emptyIcon;
@@ -145,7 +146,7 @@ void CategoryModel::setPages(const QList<IOptionsPage*> &pages,
 
     // Put the pages in categories
     foreach (IOptionsPage *page, pages) {
-        const QString &categoryId = page->category();
+        const Id categoryId = page->category();
         Category *category = findCategoryById(categoryId);
         if (!category) {
             category = new Category;
@@ -162,7 +163,7 @@ void CategoryModel::setPages(const QList<IOptionsPage*> &pages,
     }
 
     foreach (IOptionsPageProvider *provider, providers) {
-        const QString &categoryId = provider->category();
+        const Id categoryId = provider->category();
         Category *category = findCategoryById(categoryId);
         if (!category) {
             category = new Category;
@@ -181,7 +182,7 @@ void CategoryModel::setPages(const QList<IOptionsPage*> &pages,
     endResetModel();
 }
 
-Category *CategoryModel::findCategoryById(const QString &id)
+Category *CategoryModel::findCategoryById(Id id)
 {
     for (int i = 0; i < m_categories.size(); ++i) {
         Category *category = m_categories.at(i);
@@ -269,7 +270,7 @@ public:
 // Helpers to sort by category. id
 bool optionsPageLessThan(const IOptionsPage *p1, const IOptionsPage *p2)
 {
-    if (const int cc = p1->category().compare(p2->category()))
+    if (const int cc = p1->category().toString().compare(p2->category().toString()))
         return cc < 0;
     return p1->id().compare(p2->id()) < 0;
 }
@@ -329,11 +330,11 @@ SettingsDialog::SettingsDialog(QWidget *parent) :
 void SettingsDialog::showPage(Id categoryId, Id pageId)
 {
     // handle the case of "show last page"
-    QString initialCategory = categoryId.toString();
+    Id initialCategory = categoryId;
     QString initialPage = pageId.toString();
-    if (initialCategory.isEmpty() && initialPage.isEmpty()) {
+    if (!initialCategory.isValid() && initialPage.isEmpty()) {
         QSettings *settings = ICore::settings();
-        initialCategory = settings->value(QLatin1String(categoryKeyC), QVariant(QString())).toString();
+        initialCategory = Id(settings->value(QLatin1String(categoryKeyC), QVariant(QString())).toString());
         initialPage = settings->value(QLatin1String(pageKeyC), QVariant(QString())).toString();
     }
 
@@ -462,7 +463,7 @@ void SettingsDialog::updateEnabledTabs(Category *category, const QString &search
     for (int i = 0; i < category->pages.size(); ++i) {
         const IOptionsPage *page = category->pages.at(i);
         const bool enabled = searchText.isEmpty()
-                             || page->category().contains(searchText, Qt::CaseInsensitive)
+                             || page->category().toString().contains(searchText, Qt::CaseInsensitive)
                              || page->displayName().contains(searchText, Qt::CaseInsensitive)
                              || page->matches(searchText);
         category->tabWidget->setTabEnabled(i, enabled);
@@ -541,7 +542,7 @@ void SettingsDialog::apply()
 void SettingsDialog::done(int val)
 {
     QSettings *settings = ICore::settings();
-    settings->setValue(QLatin1String(categoryKeyC), m_currentCategory);
+    settings->setValue(QLatin1String(categoryKeyC), m_currentCategory.toString());
     settings->setValue(QLatin1String(pageKeyC), m_currentPage);
 
     ICore::saveSettings(); // save all settings
diff --git a/src/plugins/coreplugin/dialogs/settingsdialog.h b/src/plugins/coreplugin/dialogs/settingsdialog.h
index cbd07b03b74..ec833581213 100644
--- a/src/plugins/coreplugin/dialogs/settingsdialog.h
+++ b/src/plugins/coreplugin/dialogs/settingsdialog.h
@@ -35,7 +35,6 @@
 
 #include <QList>
 #include <QSet>
-#include <QPointer>
 #include <QEventLoop>
 #include <QDialog>
 
@@ -99,7 +98,7 @@ private:
     QSet<Core::IOptionsPage*> m_visitedPages;
     QSortFilterProxyModel *m_proxyModel;
     CategoryModel *m_model;
-    QString m_currentCategory;
+    Core::Id m_currentCategory;
     QString m_currentPage;
     QStackedLayout *m_stackedLayout;
     Utils::FilterLineEdit *m_filterLineEdit;
diff --git a/src/plugins/coreplugin/dialogs/shortcutsettings.cpp b/src/plugins/coreplugin/dialogs/shortcutsettings.cpp
index 5c0d97f3256..6200c2ce1fc 100644
--- a/src/plugins/coreplugin/dialogs/shortcutsettings.cpp
+++ b/src/plugins/coreplugin/dialogs/shortcutsettings.cpp
@@ -62,7 +62,7 @@ ShortcutSettings::ShortcutSettings(QObject *parent)
 
     setId(QLatin1String(Core::Constants::SETTINGS_ID_SHORTCUTS));
     setDisplayName(tr("Keyboard"));
-    setCategory(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE));
+    setCategory(Core::Constants::SETTINGS_CATEGORY_CORE);
     setDisplayCategory(QCoreApplication::translate("Core", Core::Constants::SETTINGS_TR_CATEGORY_CORE));
     setCategoryIcon(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE_ICON));
 }
diff --git a/src/plugins/coreplugin/generalsettings.cpp b/src/plugins/coreplugin/generalsettings.cpp
index 23bca0e5a3b..9131cea07f2 100644
--- a/src/plugins/coreplugin/generalsettings.cpp
+++ b/src/plugins/coreplugin/generalsettings.cpp
@@ -56,7 +56,7 @@ GeneralSettings::GeneralSettings():
 {
     setId(QLatin1String(Core::Constants::SETTINGS_ID_ENVIRONMENT));
     setDisplayName(tr("General"));
-    setCategory(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE));
+    setCategory(Core::Constants::SETTINGS_CATEGORY_CORE);
     setDisplayCategory(QCoreApplication::translate("Core", Core::Constants::SETTINGS_TR_CATEGORY_CORE));
     setCategoryIcon(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE_ICON));
 }
diff --git a/src/plugins/coreplugin/mimetypesettings.cpp b/src/plugins/coreplugin/mimetypesettings.cpp
index 2e0fb7b9117..f3e7d8d5e98 100644
--- a/src/plugins/coreplugin/mimetypesettings.cpp
+++ b/src/plugins/coreplugin/mimetypesettings.cpp
@@ -560,7 +560,7 @@ MimeTypeSettings::MimeTypeSettings(QObject *parent)
 {
     setId(QLatin1String(Core::Constants::SETTINGS_ID_MIMETYPES));
     setDisplayName(tr("MIME Types"));
-    setCategory(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE));
+    setCategory(Core::Constants::SETTINGS_CATEGORY_CORE);
     setDisplayCategory(QCoreApplication::translate("Core",
         Core::Constants::SETTINGS_TR_CATEGORY_CORE));
     setCategoryIcon(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE_ICON));
diff --git a/src/plugins/coreplugin/toolsettings.cpp b/src/plugins/coreplugin/toolsettings.cpp
index 528e92eb76b..06c41302c60 100644
--- a/src/plugins/coreplugin/toolsettings.cpp
+++ b/src/plugins/coreplugin/toolsettings.cpp
@@ -52,7 +52,7 @@ ToolSettings::ToolSettings(QObject *parent) :
 {
     setId(QLatin1String(Core::Constants::SETTINGS_ID_TOOLS));
     setDisplayName(tr("External Tools"));
-    setCategory(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE));
+    setCategory(Core::Constants::SETTINGS_CATEGORY_CORE);
     setDisplayCategory(QCoreApplication::translate("Core", Constants::SETTINGS_TR_CATEGORY_CORE));
     setCategoryIcon(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE_ICON));
 }
diff --git a/src/plugins/cpaster/codepastersettings.cpp b/src/plugins/cpaster/codepastersettings.cpp
index 83b0917fe60..dcca2e56ab4 100644
--- a/src/plugins/cpaster/codepastersettings.cpp
+++ b/src/plugins/cpaster/codepastersettings.cpp
@@ -53,7 +53,7 @@ CodePasterSettingsPage::CodePasterSettingsPage()
 {
     setId(QLatin1String("C.CodePaster"));
     setDisplayName(tr("CodePaster"));
-    setCategory(QLatin1String(Constants::CPASTER_SETTINGS_CATEGORY));
+    setCategory(Constants::CPASTER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("CodePaster",
         Constants::CPASTER_SETTINGS_TR_CATEGORY));
 
diff --git a/src/plugins/cpaster/fileshareprotocolsettingspage.cpp b/src/plugins/cpaster/fileshareprotocolsettingspage.cpp
index d8c6ae4b2fc..99845981696 100644
--- a/src/plugins/cpaster/fileshareprotocolsettingspage.cpp
+++ b/src/plugins/cpaster/fileshareprotocolsettingspage.cpp
@@ -100,7 +100,7 @@ FileShareProtocolSettingsPage::FileShareProtocolSettingsPage(const QSharedPointe
 {
     setId(QLatin1String("X.FileSharePaster"));
     setDisplayName(tr("Fileshare"));
-    setCategory(QLatin1String(Constants::CPASTER_SETTINGS_CATEGORY));
+    setCategory(Constants::CPASTER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("CodePaster", Constants::CPASTER_SETTINGS_TR_CATEGORY));
 }
 
diff --git a/src/plugins/cpaster/settingspage.cpp b/src/plugins/cpaster/settingspage.cpp
index 96b1f8703cb..1cf06ebd9f4 100644
--- a/src/plugins/cpaster/settingspage.cpp
+++ b/src/plugins/cpaster/settingspage.cpp
@@ -80,7 +80,7 @@ SettingsPage::SettingsPage(const QSharedPointer<Settings> &settings) :
 {
     setId(QLatin1String("A.General"));
     setDisplayName(tr("General"));
-    setCategory(QLatin1String(Constants::CPASTER_SETTINGS_CATEGORY));
+    setCategory(Constants::CPASTER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("CodePaster",
         Constants::CPASTER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::SETTINGS_CATEGORY_CPASTER_ICON));
diff --git a/src/plugins/cpptools/cppcodestylesettingspage.cpp b/src/plugins/cpptools/cppcodestylesettingspage.cpp
index a3262d8015e..bcde2893073 100644
--- a/src/plugins/cpptools/cppcodestylesettingspage.cpp
+++ b/src/plugins/cpptools/cppcodestylesettingspage.cpp
@@ -481,7 +481,7 @@ CppCodeStyleSettingsPage::CppCodeStyleSettingsPage(QWidget *parent) :
 {
     setId(QLatin1String(Constants::CPP_CODE_STYLE_SETTINGS_ID));
     setDisplayName(QCoreApplication::translate("CppTools", Constants::CPP_CODE_STYLE_SETTINGS_NAME));
-    setCategory(QLatin1String(Constants::CPP_SETTINGS_CATEGORY));
+    setCategory(Constants::CPP_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("CppTools", Constants::CPP_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::SETTINGS_CATEGORY_CPP_ICON));
 }
diff --git a/src/plugins/cpptools/cppfilesettingspage.cpp b/src/plugins/cpptools/cppfilesettingspage.cpp
index 66213189cad..42faae0f0fd 100644
--- a/src/plugins/cpptools/cppfilesettingspage.cpp
+++ b/src/plugins/cpptools/cppfilesettingspage.cpp
@@ -321,7 +321,7 @@ CppFileSettingsPage::CppFileSettingsPage(QSharedPointer<CppFileSettings> &settin
 {
     setId(QLatin1String(Constants::CPP_FILE_SETTINGS_ID));
     setDisplayName(QCoreApplication::translate("CppTools", Constants::CPP_FILE_SETTINGS_NAME));
-    setCategory(QLatin1String(Constants::CPP_SETTINGS_CATEGORY));
+    setCategory(Constants::CPP_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("CppTools", Constants::CPP_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::SETTINGS_CATEGORY_CPP_ICON));
 }
diff --git a/src/plugins/debugger/cdb/cdboptionspage.cpp b/src/plugins/debugger/cdb/cdboptionspage.cpp
index 77190c7965c..249c3995422 100644
--- a/src/plugins/debugger/cdb/cdboptionspage.cpp
+++ b/src/plugins/debugger/cdb/cdboptionspage.cpp
@@ -323,9 +323,8 @@ CdbOptionsPage::CdbOptionsPage() :
     m_options->fromSettings(Core::ICore::settings());
 
     setId(CdbOptionsPage::settingsId());
-
     setDisplayName(tr("CDB"));
-    setCategory(QLatin1String(Debugger::Constants::DEBUGGER_SETTINGS_CATEGORY));
+    setCategory(Debugger::Constants::DEBUGGER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Debugger",
         Constants::DEBUGGER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::DEBUGGER_COMMON_SETTINGS_CATEGORY_ICON));
diff --git a/src/plugins/debugger/commonoptionspage.cpp b/src/plugins/debugger/commonoptionspage.cpp
index ed128cb47b5..d070db422e9 100644
--- a/src/plugins/debugger/commonoptionspage.cpp
+++ b/src/plugins/debugger/commonoptionspage.cpp
@@ -238,7 +238,7 @@ CommonOptionsPage::CommonOptionsPage(const QSharedPointer<GlobalDebuggerOptions>
 {
     setId(QLatin1String(DEBUGGER_COMMON_SETTINGS_ID));
     setDisplayName(QCoreApplication::translate("Debugger", "General"));
-    setCategory(QLatin1String(DEBUGGER_SETTINGS_CATEGORY));
+    setCategory(DEBUGGER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Debugger", DEBUGGER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(DEBUGGER_COMMON_SETTINGS_CATEGORY_ICON));
 }
@@ -312,7 +312,7 @@ LocalsAndExpressionsOptionsPage::LocalsAndExpressionsOptionsPage()
     setId(QLatin1String("Z.LocalsAndExpressions"));
     //: '&&' will appear as one (one is marking keyboard shortcut)
     setDisplayName(QCoreApplication::translate("Debugger", "Locals && Expressions"));
-    setCategory(QLatin1String(DEBUGGER_SETTINGS_CATEGORY));
+    setCategory(DEBUGGER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Debugger", DEBUGGER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(DEBUGGER_COMMON_SETTINGS_CATEGORY_ICON));
 }
diff --git a/src/plugins/debugger/gdb/gdboptionspage.cpp b/src/plugins/debugger/gdb/gdboptionspage.cpp
index 44c0a006274..1df23cf73d4 100644
--- a/src/plugins/debugger/gdb/gdboptionspage.cpp
+++ b/src/plugins/debugger/gdb/gdboptionspage.cpp
@@ -382,7 +382,7 @@ GdbOptionsPage::GdbOptionsPage()
 {
     setId(QLatin1String("M.Gdb"));
     setDisplayName(tr("GDB"));
-    setCategory(QLatin1String(Constants::DEBUGGER_SETTINGS_CATEGORY));
+    setCategory(Constants::DEBUGGER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Debugger", Constants::DEBUGGER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::DEBUGGER_COMMON_SETTINGS_CATEGORY_ICON));
 }
diff --git a/src/plugins/debugger/lldb/lldboptionspage.cpp b/src/plugins/debugger/lldb/lldboptionspage.cpp
index 13fe0bad2d1..8675a1ccc1e 100644
--- a/src/plugins/debugger/lldb/lldboptionspage.cpp
+++ b/src/plugins/debugger/lldb/lldboptionspage.cpp
@@ -72,7 +72,7 @@ LldbOptionsPage::LldbOptionsPage()
     //    m_options->fromSettings(Core::ICore::settings());
     setId(QLatin1String("F.Lldb"));
     setDisplayName(tr("LLDB"));
-    setCategory(QLatin1String(Debugger::Constants::DEBUGGER_SETTINGS_CATEGORY));
+    setCategory(Debugger::Constants::DEBUGGER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Debugger", Constants::DEBUGGER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QIcon(QLatin1String(Constants::DEBUGGER_COMMON_SETTINGS_CATEGORY_ICON)));
 }
diff --git a/src/plugins/designer/cpp/cppsettingspage.cpp b/src/plugins/designer/cpp/cppsettingspage.cpp
index 66be2ad9020..1dbb4780836 100644
--- a/src/plugins/designer/cpp/cppsettingspage.cpp
+++ b/src/plugins/designer/cpp/cppsettingspage.cpp
@@ -107,7 +107,7 @@ CppSettingsPage::CppSettingsPage(QObject *parent) : Core::IOptionsPage(parent)
     m_parameters.fromSettings(Core::ICore::settings());
     setId(QLatin1String(Designer::Constants::SETTINGS_CPP_SETTINGS_ID));
     setDisplayName(QCoreApplication::translate("Designer", Designer::Constants::SETTINGS_CPP_SETTINGS_NAME));
-    setCategory(QLatin1String(Designer::Constants::SETTINGS_CATEGORY));
+    setCategory(Designer::Constants::SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Designer", Designer::Constants::SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Designer::Constants::SETTINGS_CATEGORY_ICON));
 }
diff --git a/src/plugins/designer/settingspage.cpp b/src/plugins/designer/settingspage.cpp
index 0e9eebd6ff4..fa4a7256742 100644
--- a/src/plugins/designer/settingspage.cpp
+++ b/src/plugins/designer/settingspage.cpp
@@ -48,7 +48,7 @@ SettingsPage::SettingsPage(QDesignerOptionsPageInterface *designerPage) :
 {
     setId(m_designerPage->name());
     setDisplayName(m_designerPage->name());
-    setCategory(QLatin1String(Designer::Constants::SETTINGS_CATEGORY));
+    setCategory(Designer::Constants::SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Designer",
         Designer::Constants::SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Designer::Constants::SETTINGS_CATEGORY_ICON));
@@ -75,7 +75,7 @@ void SettingsPage::finish()
 SettingsPageProvider::SettingsPageProvider(QObject *parent)
     : IOptionsPageProvider(parent), m_initialized(false)
 {
-    setCategory(QLatin1String(Designer::Constants::SETTINGS_CATEGORY));
+    setCategory(Designer::Constants::SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Designer",
         Designer::Constants::SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Designer::Constants::SETTINGS_CATEGORY_ICON));
diff --git a/src/plugins/fakevim/fakevimplugin.cpp b/src/plugins/fakevim/fakevimplugin.cpp
index 258902095d4..60aacdded1a 100644
--- a/src/plugins/fakevim/fakevimplugin.cpp
+++ b/src/plugins/fakevim/fakevimplugin.cpp
@@ -232,7 +232,7 @@ public:
     {
         setId(_(SETTINGS_ID));
         setDisplayName(tr("General"));
-        setCategory(_(SETTINGS_CATEGORY));
+        setCategory(SETTINGS_CATEGORY);
         setDisplayCategory(tr("FakeVim"));
         setCategoryIcon(_(SETTINGS_CATEGORY_FAKEVIM_ICON));
     }
@@ -399,7 +399,7 @@ public:
     {
         setId(_(SETTINGS_EX_CMDS_ID));
         setDisplayName(tr("Ex Command Mapping"));
-        setCategory(_(SETTINGS_CATEGORY));
+        setCategory(SETTINGS_CATEGORY);
         setDisplayCategory(tr("FakeVim"));
         setCategoryIcon(_(SETTINGS_CATEGORY_FAKEVIM_ICON));
     }
@@ -621,7 +621,7 @@ public:
     {
         setId(_(SETTINGS_USER_CMDS_ID));
         setDisplayName(tr("User Command Mapping"));
-        setCategory(_(SETTINGS_CATEGORY));
+        setCategory(SETTINGS_CATEGORY);
         setDisplayCategory(tr("FakeVim"));
         setCategoryIcon(_(SETTINGS_CATEGORY_FAKEVIM_ICON));
     }
diff --git a/src/plugins/help/docsettingspage.cpp b/src/plugins/help/docsettingspage.cpp
index a0e24ef1a87..95ce1a7bd10 100644
--- a/src/plugins/help/docsettingspage.cpp
+++ b/src/plugins/help/docsettingspage.cpp
@@ -44,7 +44,7 @@ DocSettingsPage::DocSettingsPage()
 {
     setId(QLatin1String("B.Documentation"));
     setDisplayName(tr("Documentation"));
-    setCategory(QLatin1String(Help::Constants::HELP_CATEGORY));
+    setCategory(Help::Constants::HELP_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Help", Help::Constants::HELP_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Help::Constants::HELP_CATEGORY_ICON));
 }
diff --git a/src/plugins/help/filtersettingspage.cpp b/src/plugins/help/filtersettingspage.cpp
index 5ee7d0d1b8d..dc4e29d7785 100644
--- a/src/plugins/help/filtersettingspage.cpp
+++ b/src/plugins/help/filtersettingspage.cpp
@@ -45,7 +45,7 @@ FilterSettingsPage::FilterSettingsPage()
 {
     setId(QLatin1String("D.Filters"));
     setDisplayName(tr("Filters"));
-    setCategory(QLatin1String(Help::Constants::HELP_CATEGORY));
+    setCategory(Help::Constants::HELP_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Help", Help::Constants::HELP_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Help::Constants::HELP_CATEGORY_ICON));
 }
diff --git a/src/plugins/help/generalsettingspage.cpp b/src/plugins/help/generalsettingspage.cpp
index c5cb7fd175f..fb645ec7c3f 100644
--- a/src/plugins/help/generalsettingspage.cpp
+++ b/src/plugins/help/generalsettingspage.cpp
@@ -65,7 +65,7 @@ GeneralSettingsPage::GeneralSettingsPage()
 #endif
     setId(QLatin1String("A.General settings"));
     setDisplayName(tr("General"));
-    setCategory(QLatin1String(Help::Constants::HELP_CATEGORY));
+    setCategory(Help::Constants::HELP_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("Help", Help::Constants::HELP_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Help::Constants::HELP_CATEGORY_ICON));
 }
diff --git a/src/plugins/locator/settingspage.cpp b/src/plugins/locator/settingspage.cpp
index 4a72047f9cd..4772d728d88 100644
--- a/src/plugins/locator/settingspage.cpp
+++ b/src/plugins/locator/settingspage.cpp
@@ -50,7 +50,7 @@ SettingsPage::SettingsPage(LocatorPlugin *plugin)
 {
     setId(QLatin1String(Constants::FILTER_OPTIONS_PAGE));
     setDisplayName(QCoreApplication::translate("Locator", Locator::Constants::FILTER_OPTIONS_PAGE));
-    setCategory(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE));
+    setCategory(Core::Constants::SETTINGS_CATEGORY_CORE);
     setDisplayCategory(QCoreApplication::translate("Core", Core::Constants::SETTINGS_TR_CATEGORY_CORE));
     setCategoryIcon(QLatin1String(Core::Constants::SETTINGS_CATEGORY_CORE_ICON));
 }
diff --git a/src/plugins/macros/macrooptionspage.cpp b/src/plugins/macros/macrooptionspage.cpp
index fbc5efc01cb..8fe4c4e8ae4 100644
--- a/src/plugins/macros/macrooptionspage.cpp
+++ b/src/plugins/macros/macrooptionspage.cpp
@@ -48,7 +48,7 @@ MacroOptionsPage::MacroOptionsPage(QObject *parent)
 {
     setId(QLatin1String(Constants::M_OPTIONS_PAGE));
     setDisplayName(QCoreApplication::translate("Macros", Constants::M_OPTIONS_TR_PAGE));
-    setCategory(QLatin1String(TextEditor::Constants::TEXT_EDITOR_SETTINGS_CATEGORY));
+    setCategory(TextEditor::Constants::TEXT_EDITOR_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("TextEditor",
         TextEditor::Constants::TEXT_EDITOR_SETTINGS_TR_CATEGORY));
 }
diff --git a/src/plugins/madde/maemosettingspages.cpp b/src/plugins/madde/maemosettingspages.cpp
index 6fd95571d86..12d742eff51 100644
--- a/src/plugins/madde/maemosettingspages.cpp
+++ b/src/plugins/madde/maemosettingspages.cpp
@@ -105,7 +105,7 @@ MaemoQemuSettingsPage::MaemoQemuSettingsPage(QObject *parent)
 {
     setId(pageId());
     setDisplayName(tr("MeeGo Qemu Settings"));
-    setCategory(pageCategory().toString());
+    setCategory(pageCategory());
     //setDisplayCategory(QString()); // Will be set by device configurations page.
     //setCategoryIcon(QIcon()) // See above.
 }
diff --git a/src/plugins/projectexplorer/devicesupport/devicesettingspage.cpp b/src/plugins/projectexplorer/devicesupport/devicesettingspage.cpp
index d55f220f18a..f6280a72eec 100644
--- a/src/plugins/projectexplorer/devicesupport/devicesettingspage.cpp
+++ b/src/plugins/projectexplorer/devicesupport/devicesettingspage.cpp
@@ -44,7 +44,7 @@ DeviceSettingsPage::DeviceSettingsPage(QObject *parent)
 {
     setId(QLatin1String(Constants::DEVICE_SETTINGS_PAGE_ID));
     setDisplayName(tr("Devices"));
-    setCategory(QLatin1String(Constants::DEVICE_SETTINGS_CATEGORY));
+    setCategory(Constants::DEVICE_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("ProjectExplorer", "Devices"));
     setCategoryIcon(QLatin1String(":/projectexplorer/images/MaemoDevice.png"));
 }
diff --git a/src/plugins/projectexplorer/kitoptionspage.cpp b/src/plugins/projectexplorer/kitoptionspage.cpp
index 2aee5a777ad..4e253ab9986 100644
--- a/src/plugins/projectexplorer/kitoptionspage.cpp
+++ b/src/plugins/projectexplorer/kitoptionspage.cpp
@@ -57,7 +57,7 @@ KitOptionsPage::KitOptionsPage() :
 {
     setId(QLatin1String(Constants::KITS_SETTINGS_PAGE_ID));
     setDisplayName(tr("Kits"));
-    setCategory(QLatin1String(Constants::PROJECTEXPLORER_SETTINGS_CATEGORY));
+    setCategory(Constants::PROJECTEXPLORER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("ProjectExplorer",
                                        Constants::PROJECTEXPLORER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::PROJECTEXPLORER_SETTINGS_CATEGORY_ICON));
diff --git a/src/plugins/projectexplorer/projectexplorersettingspage.cpp b/src/plugins/projectexplorer/projectexplorersettingspage.cpp
index ce6125e7141..894fd3bbbec 100644
--- a/src/plugins/projectexplorer/projectexplorersettingspage.cpp
+++ b/src/plugins/projectexplorer/projectexplorersettingspage.cpp
@@ -177,7 +177,7 @@ ProjectExplorerSettingsPage::ProjectExplorerSettingsPage()
 {
     setId(QLatin1String(Constants::PROJECTEXPLORER_SETTINGS_ID));
     setDisplayName(tr("General"));
-    setCategory(QLatin1String(Constants::PROJECTEXPLORER_SETTINGS_CATEGORY));
+    setCategory(Constants::PROJECTEXPLORER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("ProjectExplorer",
         Constants::PROJECTEXPLORER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::PROJECTEXPLORER_SETTINGS_CATEGORY_ICON));
diff --git a/src/plugins/projectexplorer/toolchainoptionspage.cpp b/src/plugins/projectexplorer/toolchainoptionspage.cpp
index 31c6a951207..de5c314fc8c 100644
--- a/src/plugins/projectexplorer/toolchainoptionspage.cpp
+++ b/src/plugins/projectexplorer/toolchainoptionspage.cpp
@@ -447,7 +447,7 @@ ToolChainOptionsPage::ToolChainOptionsPage() :
 {
     setId(QLatin1String(Constants::TOOLCHAIN_SETTINGS_PAGE_ID));
     setDisplayName(tr("Compilers"));
-    setCategory(QLatin1String(Constants::PROJECTEXPLORER_SETTINGS_CATEGORY));
+    setCategory(Constants::PROJECTEXPLORER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("ProjectExplorer",
         Constants::PROJECTEXPLORER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::PROJECTEXPLORER_SETTINGS_CATEGORY_ICON));
diff --git a/src/plugins/qmldesigner/settingspage.cpp b/src/plugins/qmldesigner/settingspage.cpp
index f84b84c16cf..4e5e2f5d8d8 100644
--- a/src/plugins/qmldesigner/settingspage.cpp
+++ b/src/plugins/qmldesigner/settingspage.cpp
@@ -86,7 +86,7 @@ SettingsPage::SettingsPage() :
 {
     setId(QLatin1String("B.QmlDesigner"));
     setDisplayName(tr("Qt Quick Designer"));
-    setCategory(QLatin1String(QmlJSEditor::Constants::SETTINGS_CATEGORY_QML));
+    setCategory(QmlJSEditor::Constants::SETTINGS_CATEGORY_QML);
     setDisplayCategory(QCoreApplication::translate("QmlJSEditor",
         QmlJSEditor::Constants::SETTINGS_TR_CATEGORY_QML));
     setCategoryIcon(QLatin1String(Constants::SETTINGS_CATEGORY_QML_ICON));
diff --git a/src/plugins/qmljseditor/quicktoolbarsettingspage.cpp b/src/plugins/qmljseditor/quicktoolbarsettingspage.cpp
index 30da0a4df19..4acb89232d4 100644
--- a/src/plugins/qmljseditor/quicktoolbarsettingspage.cpp
+++ b/src/plugins/qmljseditor/quicktoolbarsettingspage.cpp
@@ -123,7 +123,7 @@ QuickToolBarSettingsPage::QuickToolBarSettingsPage() :
 {
     setId(QLatin1String("C.QmlToolbar"));
     setDisplayName(tr("Qt Quick ToolBar"));
-    setCategory(QLatin1String(Constants::SETTINGS_CATEGORY_QML));
+    setCategory(Constants::SETTINGS_CATEGORY_QML);
     setDisplayCategory(QCoreApplication::translate("QmlJSEditor",
         QmlJSEditor::Constants::SETTINGS_TR_CATEGORY_QML));
     setCategoryIcon(QLatin1String(QmlDesigner::Constants::SETTINGS_CATEGORY_QML_ICON));
diff --git a/src/plugins/qmljstools/qmljscodestylesettingspage.cpp b/src/plugins/qmljstools/qmljscodestylesettingspage.cpp
index 9e2e936c187..63ada182946 100644
--- a/src/plugins/qmljstools/qmljscodestylesettingspage.cpp
+++ b/src/plugins/qmljstools/qmljscodestylesettingspage.cpp
@@ -168,7 +168,7 @@ QmlJSCodeStyleSettingsPage::QmlJSCodeStyleSettingsPage(/*QSharedPointer<CppFileS
 {
     setId(QLatin1String(Constants::QML_JS_CODE_STYLE_SETTINGS_ID));
     setDisplayName(QCoreApplication::translate("QmlJSTools", Constants::QML_JS_CODE_STYLE_SETTINGS_NAME));
-    setCategory(QLatin1String(QmlJSEditor::Constants::SETTINGS_CATEGORY_QML));
+    setCategory(QmlJSEditor::Constants::SETTINGS_CATEGORY_QML);
     setDisplayCategory(QCoreApplication::translate("QmlJSEditor", QmlJSEditor::Constants::SETTINGS_TR_CATEGORY_QML));
     setCategoryIcon(QLatin1String(QmlDesigner::Constants::SETTINGS_CATEGORY_QML_ICON));
 }
diff --git a/src/plugins/qtsupport/qtoptionspage.cpp b/src/plugins/qtsupport/qtoptionspage.cpp
index 9ea789611d9..43c3f1b93b1 100644
--- a/src/plugins/qtsupport/qtoptionspage.cpp
+++ b/src/plugins/qtsupport/qtoptionspage.cpp
@@ -72,7 +72,7 @@ QtOptionsPage::QtOptionsPage()
 {
     setId(QLatin1String(Constants::QTVERSION_SETTINGS_PAGE_ID));
     setDisplayName(QCoreApplication::translate("Qt4ProjectManager", Constants::QTVERSION_SETTINGS_PAGE_NAME));
-    setCategory(QLatin1String(ProjectExplorer::Constants::PROJECTEXPLORER_SETTINGS_CATEGORY));
+    setCategory(ProjectExplorer::Constants::PROJECTEXPLORER_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("ProjectExplorer",
         ProjectExplorer::Constants::PROJECTEXPLORER_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(ProjectExplorer::Constants::PROJECTEXPLORER_SETTINGS_CATEGORY_ICON));
diff --git a/src/plugins/texteditor/fontsettingspage.cpp b/src/plugins/texteditor/fontsettingspage.cpp
index 8fca3108e0f..9d17286cf51 100644
--- a/src/plugins/texteditor/fontsettingspage.cpp
+++ b/src/plugins/texteditor/fontsettingspage.cpp
@@ -318,7 +318,7 @@ FontSettingsPage::FontSettingsPage(const FormatDescriptions &fd,
                                    const QString &id,
                                    QObject *parent) :
     TextEditorOptionsPage(parent),
-    d_ptr(new FontSettingsPagePrivate(fd, id, tr("Font && Colors"), category()))
+    d_ptr(new FontSettingsPagePrivate(fd, id, tr("Font && Colors"), category().toString()))
 {
     setId(d_ptr->m_id);
     setDisplayName(d_ptr->m_displayName);
diff --git a/src/plugins/texteditor/texteditoroptionspage.cpp b/src/plugins/texteditor/texteditoroptionspage.cpp
index d6429a41546..41e95d2680b 100644
--- a/src/plugins/texteditor/texteditoroptionspage.cpp
+++ b/src/plugins/texteditor/texteditoroptionspage.cpp
@@ -38,7 +38,7 @@ using namespace TextEditor;
 TextEditorOptionsPage::TextEditorOptionsPage(QObject *parent) :
     Core::IOptionsPage(parent)
 {
-    setCategory(QLatin1String(Constants::TEXT_EDITOR_SETTINGS_CATEGORY));
+    setCategory(Constants::TEXT_EDITOR_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("TextEditor", Constants::TEXT_EDITOR_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::TEXT_EDITOR_SETTINGS_CATEGORY_ICON));
 }
diff --git a/src/plugins/todo/optionspage.cpp b/src/plugins/todo/optionspage.cpp
index bd62c6e5473..5f5b433fb2c 100644
--- a/src/plugins/todo/optionspage.cpp
+++ b/src/plugins/todo/optionspage.cpp
@@ -51,7 +51,7 @@ OptionsPage::OptionsPage(const Settings &settings, QObject *parent) :
 
     setId(QLatin1String("TodoSettings"));
     setDisplayName(tr("To-Do"));
-    setCategory(QLatin1String("To-Do"));
+    setCategory("To-Do");
     setDisplayCategory(tr("To-Do"));
     setCategoryIcon(QLatin1String(Constants::ICON_TODO));
 }
diff --git a/src/plugins/vcsbase/vcsbaseoptionspage.cpp b/src/plugins/vcsbase/vcsbaseoptionspage.cpp
index c98ba0ebdbd..2c1f19e61fb 100644
--- a/src/plugins/vcsbase/vcsbaseoptionspage.cpp
+++ b/src/plugins/vcsbase/vcsbaseoptionspage.cpp
@@ -44,7 +44,7 @@ namespace VcsBase {
 VcsBaseOptionsPage::VcsBaseOptionsPage(QObject *parent) :
     Core::IOptionsPage(parent)
 {
-    setCategory(QLatin1String(Constants::VCS_SETTINGS_CATEGORY));
+    setCategory(Constants::VCS_SETTINGS_CATEGORY);
     setDisplayCategory(QCoreApplication::translate("VcsBase", Constants::VCS_SETTINGS_TR_CATEGORY));
     setCategoryIcon(QLatin1String(Constants::SETTINGS_CATEGORY_VCS_ICON));
 }