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diff --git a/src/Language/Fiddle/Compiler/Qualification.hs b/src/Language/Fiddle/Compiler/Qualification.hs
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+-- | Qualification compilation phase.
+--
+-- The qualification phase is responsible for resolving all type references in
+-- the AST to their fully-qualified counterparts. This process involves
+-- replacing unqualified references with their fully-qualified names and
+-- attaching the necessary metadata to each reference. This enriched information
+-- is then available for use in later stages of the compilation pipeline.
+--
+-- In this phase, symbol resolution statements (such as 'using' statements) are
+-- removed, as they become unnecessary once references are fully qualified.
+-- Additionally, package structures are flattened, and package declarations are
+-- discarded since full qualification renders them redundant.
+module Language.Fiddle.Compiler.Qualification (qualificationPhase) where
+
+import Control.Monad.Identity
+import Data.Word
+import Language.Fiddle.Ast
+import Language.Fiddle.Compiler
+import Language.Fiddle.Compiler.ConsistencyCheck
+import Language.Fiddle.Internal.Scopes
+import Language.Fiddle.Internal.UnitInterface
+import Language.Fiddle.Types
+
+type CurrentStage = Expanded
+
+data GlobalState = GlobalState
+  { globalScope :: Scope String (Either SizeBits SizeBytes),
+    fileDependencies :: [FilePath],
+    unitInterface :: UnitInterface
+  }
+
+newtype LocalState = LocalState (ScopePath String)
+
+type I = Identity
+
+type Annot = Commented SourceSpan
+
+type SizeBits = Word32
+
+type SizeBytes = Word32
+
+instance CompilationStage Expanded where
+  type StageAfter Expanded = Qualified
+  type StageMonad Expanded = Compile GlobalState
+  type StageState Expanded = LocalState
+  type StageFunctor Expanded = Identity
+  type StageAnnotation Expanded = Commented SourceSpan
+
+qualificationPhase :: CompilationPhase Expanded Qualified
+qualificationPhase =
+  pureCompilationPhase $
+    fmap snd
+      . subCompile (GlobalState mempty mempty mempty)
+      . advanceStage (LocalState mempty)
+
+deriving instance AdvanceStage CurrentStage ObjTypeBody
+
+deriving instance AdvanceStage CurrentStage DeferredRegisterBody
+
+deriving instance AdvanceStage CurrentStage RegisterBody
+
+deriving instance AdvanceStage CurrentStage AnonymousBitsType
+
+deriving instance AdvanceStage CurrentStage ImportStatement
+
+deriving instance AdvanceStage CurrentStage BitType
+
+deriving instance AdvanceStage CurrentStage EnumBody
+
+deriving instance AdvanceStage CurrentStage EnumConstantDecl
+
+deriving instance AdvanceStage CurrentStage RegisterBitsDecl
+
+deriving instance AdvanceStage CurrentStage PackageBody
+
+deriving instance AdvanceStage CurrentStage ObjTypeDecl
+
+deriving instance AdvanceStage CurrentStage FiddleDecl
+
+deriving instance AdvanceStage CurrentStage FiddleUnit
+
+deriving instance AdvanceStage CurrentStage Expression
+
+deriving instance AdvanceStage CurrentStage RegisterBitsTypeRef
+
+deriving instance AdvanceStage CurrentStage ObjType
+
+deriving instance (AdvanceStage CurrentStage t) => AdvanceStage CurrentStage (Directed t)