diff --git a/src/Cont.agda b/src/Cont.agda
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+
+module Cont where
+
+open import ActorMonad
+open import SimulationEnvironment
+open import Membership using (_∈_ ; _⊆_ ; [] ; _∷_ ; Z ; S ; lookup-parallel ; lookup-parallel-≡ ; translate-∈ ; x∈[]-⊥ ; translate-⊆ ; ⊆-trans ; find-∈)
+
+open import Data.List using (List ; _∷_ ; [] ; map ; _++_ ; drop)
+open import Data.List.All using (All ; _∷_ ; []; lookup) renaming (map to ∀map)
+open import Data.List.All.Properties using (++⁺ ; drop⁺)
+open import Data.List.Properties using (map-++-commute)
+open import Data.List.Any using (Any ; here ; there)
+open import Data.Nat using (ℕ ; zero ; suc ; _≟_ ; _<_)
+open import Data.Nat.Properties using (≤-reflexive)
+open import Data.Product using (Σ ; _,_ ; _×_ ; Σ-syntax)
+open import Data.Unit using (⊤ ; tt)
+open import Data.Empty using (⊥ ; ⊥-elim)
+
+open import Relation.Binary.PropositionalEquality using (_≡_ ; refl ; sym ; cong ; cong₂ ; trans)
+open import Relation.Nullary using (Dec ; yes ; no)
+
+open import Level using (Lift ; lift)
+open import Size using (Size; ∞)
+
+open Actor
+open ValidActor
+open Env
+open NamedInbox
+
+
+Cont : ∀ (i : Size) (IS : InboxShape) {A B : Set₁}
+              (pre : A → TypingContext)
+              (post : B → TypingContext) →
+              Set₂
+Cont i IS {A} {B} pre post = (x : A) → ∞ActorM i IS B (pre x) post
+
+data ContStack (i : Size) (IS : InboxShape) {A : Set₁} (pre : A → TypingContext) :
+    ∀ {B : Set₁} (post : B → TypingContext) → Set₂ where
+  []    : ContStack i IS pre pre
+  _∷_   : ∀{B C}{mid : B → TypingContext} {post : C → TypingContext}
+        → Cont i IS pre mid → ContStack i IS mid post → ContStack i IS pre post
+
+record ActorState (i : Size) (IS : InboxShape) (C : Set₁) (pre : TypingContext) (post : C → TypingContext) : Set₂ where
+  field
+    {A}   : Set₁
+    {mid} : A → TypingContext
+    act   : ActorM i IS A pre mid
+    cont  : ContStack i IS mid post