diff --git a/formalizations/guarded-cubical/Semantics/Concrete/DoublePoset/DPMorRelation.agda b/formalizations/guarded-cubical/Semantics/Concrete/DoublePoset/DPMorRelation.agda
new file mode 100644
index 0000000000000000000000000000000000000000..b51346b8a0226d8cee948b1204fcfbb9a679bc88
--- /dev/null
+++ b/formalizations/guarded-cubical/Semantics/Concrete/DoublePoset/DPMorRelation.agda
@@ -0,0 +1,91 @@
+{-# OPTIONS --guarded --rewriting #-}
+
+
+-- to allow opening this module in other files while there are still holes
+{-# OPTIONS --allow-unsolved-metas #-}
+
+module Semantics.Concrete.DoublePoset.DPMorRelation where
+
+open import Cubical.Foundations.Prelude
+open import Cubical.Foundations.Function
+
+open import Cubical.Relation.Binary
+open import Cubical.Foundations.Structure
+open import Cubical.Foundations.Isomorphism
+open import Cubical.Foundations.HLevels
+open import Cubical.Data.Sigma
+open import Cubical.Data.Sum hiding (elim)
+open import Cubical.Data.Empty hiding (elim)
+open import Cubical.Reflection.Base
+open import Cubical.Reflection.RecordEquiv
+open import Cubical.HITs.PropositionalTruncation
+open import Cubical.Foundations.Univalence
+
+open import Common.Common
+open import Common.LaterProperties
+open import Semantics.Concrete.DoublePoset.Base
+open import Semantics.Concrete.DoublePoset.Convenience
+open import Semantics.Concrete.DoublePoset.Constructions
+open import Semantics.Concrete.DoublePoset.Morphism
+open import Common.Later
+
+open BinaryRelation
+
+private
+  variable
+    â„“X â„“'X â„“''X â„“Y â„“'Y â„“''Y â„“Z â„“'Z â„“''Z â„“A â„“'A â„“''A â„“B â„“'B â„“''B : Level
+    â„“X' â„“'X' â„“Y' â„“'Y' â„“Z' â„“'Z' â„“A' â„“'A' â„“B' â„“'B' : Level
+    â„“ â„“' â„“'' â„“R â„“R' â„“R'' : Level
+    â„“o : Level
+
+    X : DoublePoset â„“X â„“'X â„“''X
+    Y : DoublePoset â„“Y â„“'Y â„“''Y
+
+
+record DPMorRel (X : DoublePoset â„“X â„“'X â„“''X) (Y : DoublePoset â„“Y â„“'Y â„“''Y) (â„“R : Level) :
+  Type (â„“-max (â„“-max (â„“-max â„“X â„“'X) (â„“-max â„“Y â„“'Y)) (â„“-suc â„“R)) where
+  module X = DblPosetStr (X .snd)
+  module Y = DblPosetStr (Y .snd)
+  _≤X_ = X._≤_
+  _≤Y_ = Y._≤_
+  field
+    R : ⟨ X ⟩ -> ⟨ Y ⟩ -> Type ℓR
+    is-prop-valued : (x : ⟨ X ⟩) -> (y : ⟨ Y ⟩) -> isProp (R x y)
+    is-antitone : ∀ {x' x y} -> x' ≤X x -> R x y -> R x' y
+    is-monotone : ∀ {x y y'} -> R x y -> y ≤Y y' -> R x y'
+
+open DPMorRel hiding (module X ; module Y ; _≤X_ ; _≤Y_)
+
+record DPMorRel' (X : DoublePoset â„“X â„“'X â„“''X) (Y : DoublePoset â„“Y â„“'Y â„“''Y) (â„“R : Level) :
+  Type (â„“-max (â„“-max (â„“-max â„“X â„“'X) (â„“-max â„“Y â„“'Y)) (â„“-suc â„“R)) where
+  module X = DblPosetStr (X .snd)
+  module Y = DblPosetStr (Y .snd)
+  _≤X_ = X._≤_
+  _≤Y_ = Y._≤_
+  field
+    R : ⟨ X ⟩ -> ⟨ Y ⟩ -> hProp ℓR
+    is-antitone : ∀ x' x y -> x' ≤X x -> ⟨ R x y ⟩ -> ⟨ R x' y ⟩
+    is-monotone : ∀ x y y' -> ⟨ R x y ⟩ -> y ≤Y y' -> ⟨ R x y' ⟩
+
+
+
+dblposet-monrel : {â„“o : Level} -> (X : DoublePoset â„“ â„“' â„“'') -> DPMorRel X X (â„“-max â„“' â„“o)
+dblposet-monrel {â„“' = â„“'} {â„“o = â„“o} X = record {
+  R = λ x x' -> Lift {i = ℓ'} {j = ℓo} (rel-≤ X x x') ;
+  is-prop-valued = λ x x' -> isOfHLevelLift 1 (prop-valued-≤ X x x') ;
+  is-antitone = λ {x'} {x} {y}  x'≤x x≤y -> lift (transitive-≤ X x' x y x'≤x (lower x≤y)) ;
+  is-monotone = λ {x}  {y} {y'} x≤y y≤y' -> lift (transitive-≤ X x y y' (lower x≤y) y≤y') }
+
+
+_==>dpmonrel_ : {â„“R : Level} {Ai Ao Bi Bo : DoublePoset â„“ â„“' â„“''} ->
+  DPMorRel Ai Bi â„“R ->
+  DPMorRel Ao Bo â„“R ->
+  DPMorRel (Ai ==> Ao) (Bi ==> Bo) (â„“-max â„“ â„“R)
+R ==>dpmonrel S = record {
+  R = λ f g ->
+    TwoCell (DPMorRel.R R) (DPMorRel.R S) (DPMor.f f) (DPMor.f g)  ;
+  is-prop-valued = λ f g -> isPropTwoCell (S .DPMorRel.is-prop-valued) ;
+  is-antitone = λ {f1} {f2} {g} f1≤f2 f1≤g  a b aRb →
+    S .DPMorRel.is-antitone (f1≤f2 a) (f1≤g a b aRb) ;
+  is-monotone = λ {f} {g1} {g2} f≤g1 g1≤g2 a b aRb →
+    S .DPMorRel.is-monotone (f≤g1 a b aRb) (g1≤g2 b) }
diff --git a/formalizations/guarded-cubical/Semantics/Concrete/DoublePoset/DblDyn.agda b/formalizations/guarded-cubical/Semantics/Concrete/DoublePoset/DblDyn.agda
new file mode 100644
index 0000000000000000000000000000000000000000..8dc0b7eef689f11e7aaa2c0e8f4f872490269374
--- /dev/null
+++ b/formalizations/guarded-cubical/Semantics/Concrete/DoublePoset/DblDyn.agda
@@ -0,0 +1,70 @@
+{-# OPTIONS --rewriting --guarded #-}
+
+ -- to allow opening this module in other files while there are still holes
+{-# OPTIONS --allow-unsolved-metas #-}
+
+{-# OPTIONS --lossy-unification #-}
+
+
+
+open import Common.Later
+
+module Semantics.Concrete.DoublePoset.DblDyn (k : Clock) where
+
+open import Cubical.Foundations.Prelude
+open import Cubical.Foundations.HLevels
+open import Cubical.Foundations.Isomorphism
+open import Cubical.Foundations.Structure
+open import Cubical.Foundations.Equiv
+open import Cubical.Foundations.Univalence
+open import Cubical.Foundations.Transport
+
+open import Cubical.Relation.Binary
+open import Cubical.Data.Nat renaming (â„• to Nat)
+open import Cubical.Data.Sum
+open import Cubical.Data.Unit
+open import Cubical.Data.Empty
+open import Cubical.Data.Sigma
+
+open import Common.LaterProperties
+open import Semantics.Lift k
+-- open import Semantics.Concrete.LiftPreorder k
+
+open import Semantics.Concrete.DoublePoset.Base
+open import Semantics.Concrete.DoublePoset.Convenience
+open import Semantics.Concrete.DoublePoset.Constructions
+open import Semantics.Concrete.DoublePoset.Morphism
+open import Semantics.MonotoneCombinators
+open import Semantics.Concrete.DoublePoset.DPMorProofs
+
+open import Semantics.Concrete.DoublePoset.LockStepErrorBisim k
+
+open BinaryRelation
+open LiftDoublePoset
+open ClockedCombinators k
+
+private
+  variable
+    â„“ â„“' â„“X â„“X' : Level
+
+  ▹_ : Type ℓ → Type ℓ
+  â–¹_ A = â–¹_,_ k A
+
+
+DynP' : (D : â–¹ DoublePoset â„“-zero â„“-zero â„“-zero) -> DoublePoset â„“-zero â„“-zero â„“-zero
+DynP' D = ℕ ⊎p (DP▸ k (λ t → D t ==> 𝕃 (D t)))
+
+DynP : DoublePoset â„“-zero â„“-zero â„“-zero
+DynP = fix DynP'
+
+unfold-DynP : DynP ≡ DynP' (next DynP)
+unfold-DynP = fix-eq DynP'
+
+unfold-⟨DynP⟩ : ⟨ DynP ⟩ ≡ ⟨ DynP' (next DynP) ⟩
+unfold-⟨DynP⟩ = λ i → ⟨ unfold-DynP i ⟩
+
+DynP-Sum : DynP ≡ ℕ ⊎p ((DP▸' k) (DynP ==> 𝕃 DynP))
+DynP-Sum = unfold-DynP
+
+⟨DynP⟩-Sum : ⟨ DynP ⟩ ≡ Nat ⊎ (▹ (⟨ DynP ==> 𝕃 DynP ⟩))
+⟨DynP⟩-Sum i = ⟨ DynP-Sum i ⟩
diff --git a/formalizations/guarded-cubical/Semantics/Concrete/DoublePoset/LockStepErrorBisim.agda b/formalizations/guarded-cubical/Semantics/Concrete/DoublePoset/LockStepErrorBisim.agda
new file mode 100644
index 0000000000000000000000000000000000000000..afe5e15a747d768ebc36ac298695a3f6a42b762f
--- /dev/null
+++ b/formalizations/guarded-cubical/Semantics/Concrete/DoublePoset/LockStepErrorBisim.agda
@@ -0,0 +1,236 @@
+{-# OPTIONS --cubical --rewriting --guarded #-}
+
+ -- to allow opening this module in other files while there are still holes
+{-# OPTIONS --allow-unsolved-metas #-}
+
+open import Common.Later
+
+module Semantics.Concrete.DoublePoset.LockStepErrorBisim (k : Clock) where
+
+open import Cubical.Relation.Binary
+
+open import Cubical.Foundations.Prelude
+open import Cubical.Foundations.Function
+open import Cubical.Foundations.Transport
+
+open import Cubical.Data.Sigma
+
+open import Cubical.Data.Nat hiding (_^_) renaming (â„• to Nat)
+open import Cubical.Data.Bool.Base
+open import Cubical.Data.Bool.Properties hiding (_≤_)
+open import Cubical.Data.Empty hiding (rec)
+open import Cubical.Data.Sum hiding (rec)
+open import Cubical.Foundations.Structure
+open import Cubical.Foundations.HLevels
+open import Cubical.Foundations.Isomorphism
+open import Cubical.Foundations.Equiv
+
+open import Cubical.Relation.Nullary
+open import Cubical.Relation.Binary.Base
+open import Cubical.Relation.Binary.Poset
+
+open import Cubical.Data.Unit.Properties
+
+open import Agda.Primitive
+
+open import Common.Common
+open import Semantics.Lift k
+open import Semantics.Concrete.DoublePoset.Base
+open import Semantics.Concrete.DoublePoset.Convenience
+open import Semantics.Concrete.DoublePoset.Constructions
+open import Semantics.Concrete.DoublePoset.DPMorRelation
+open import Semantics.LockStepErrorOrdering k
+open import Semantics.WeakBisimilarity k
+
+
+open BinaryRelation
+open DblPosetStr hiding (_≤_)
+
+private
+  variable
+    â„“ â„“' â„“'' : Level
+    â„“A â„“'A â„“''A â„“B â„“'B â„“''B â„“C â„“'C â„“''C : Level
+    â„“X â„“'X â„“Y â„“'Y : Level
+    â„“R â„“R1 â„“R2 : Level
+    A B : Set â„“
+private
+  ▹_ : Type ℓ → Type ℓ
+  â–¹_ A = â–¹_,_ k A
+
+module LiftDoublePoset (A : DoublePoset â„“ â„“' â„“'') where
+  module A = DblPosetStr (A .snd)
+  open import Common.Poset.MonotoneRelation
+  open A using (_≤_)
+  open LiftRelation ⟨ A ⟩ ⟨ A ⟩ _≤_ public
+
+  A⊎1 : DoublePoset ℓ (ℓ-max ℓ' ℓ-zero) (ℓ-max ℓ'' ℓ-zero)
+  A⊎1 = A ⊎p UnitDP
+
+  Bisim-⊎ : ⟨ A ⟩ ⊎ Unit → ⟨ A ⟩ ⊎ Unit → Type ℓ''
+  Bisim-⊎ = A⊎1 .snd ._≈_
+  -- Bisim-⊎ (inl a) (inl a') = a A.≈ a'
+  -- Bisim-⊎ (inr tt) (inr tt) = Unit*
+  -- Bisim-⊎ _ _ = ⊥*
+ 
+
+  module LiftBisim = Bisim (⟨ A ⟩ ⊎ Unit) Bisim-⊎
+
+  -- temporarily placed here
+  module FunctionalRel {X' : Type â„“'X} {X : Type â„“X} {Y' : Type â„“'Y} {Y : Type â„“Y}
+     (f : X' -> X) (g : Y' -> Y) (R : X -> Y -> Type â„“R) where
+    functionalRelation :  (X' -> Y' -> Type â„“R)
+    functionalRelation = λ x' y' → R (f x') (g y')
+
+  module _ {X' : Type â„“'X} {X : Type â„“X} (f : X' -> X) (R : X -> X -> Type â„“R) (isReflR : isRefl R) where
+    open FunctionalRel f f R
+    functionalRel-refl : isRefl functionalRelation
+    functionalRel-refl = λ x' -> isReflR (f x')
+
+  module _ {X' : Type â„“'X} {X : Type â„“X} (f : X' -> X) (R : X -> X -> Type â„“R) (isSymR : isSym R) where
+    open FunctionalRel f f R
+    functionalRel-sym : isSym functionalRelation
+    functionalRel-sym x' y' funRelxy = isSymR (f x') (f y') funRelxy
+
+  module _ {X' : Type â„“'X} {X : Type â„“X} {Y' : Type â„“'Y} {Y : Type â„“Y}
+     (f : X' -> X) (g : Y' -> Y) (R : X -> Y -> Type â„“R)
+     (isPropValuedR : ∀ x y -> isProp (R x y)) where
+     open FunctionalRel f g R
+     functionalRel-propValued : ∀ x' y' -> isProp (functionalRelation x' y')
+     functionalRel-propValued x' y' p q = isPropValuedR (f x') (g y') p q
+
+
+
+
+  L℧A→LA⊎Unit' : ▹ (L℧ ⟨ A ⟩ → L (⟨ A ⟩ ⊎ Unit)) -> L℧ ⟨ A ⟩ → L (⟨ A ⟩ ⊎ Unit)
+  L℧A→LA⊎Unit' IH (η a) = η (inl a)
+  L℧A→LA⊎Unit' IH ℧ = η (inr tt)
+  L℧A→LA⊎Unit' IH (θ la~) = θ (λ t → IH t (la~ t))
+  
+  L℧A→LA⊎Unit : L℧ ⟨ A ⟩ → L (⟨ A ⟩ ⊎ Unit)
+  L℧A→LA⊎Unit = fix L℧A→LA⊎Unit'
+
+  LA⊎Unit→L℧A' : ▹ (L (⟨ A ⟩ ⊎ Unit) → L℧ ⟨ A ⟩) -> L (⟨ A ⟩ ⊎ Unit) → L℧ ⟨ A ⟩
+  LA⊎Unit→L℧A' IH (η (inl a)) = η a
+  LA⊎Unit→L℧A' IH (η (inr tt)) = ℧
+  LA⊎Unit→L℧A' IH (θ la~) = θ (λ t → IH t (la~ t))
+
+  LA⊎Unit→L℧A : L (⟨ A ⟩ ⊎ Unit) → L℧ ⟨ A ⟩
+  LA⊎Unit→L℧A = fix LA⊎Unit→L℧A'
+
+  unfold-L→L℧ : LA⊎Unit→L℧A ≡ LA⊎Unit→L℧A' (next LA⊎Unit→L℧A)
+  unfold-L→L℧ = fix-eq LA⊎Unit→L℧A'
+
+  unfold-L℧→L : L℧A→LA⊎Unit ≡ L℧A→LA⊎Unit' (next L℧A→LA⊎Unit)
+  unfold-L℧→L = fix-eq L℧A→LA⊎Unit'
+
+  L℧ALA⊎Unit-iso : Iso (L℧ ⟨ A ⟩) (L (⟨ A ⟩ ⊎ Unit))
+  L℧ALA⊎Unit-iso =
+    iso to inv sec is-retract
+    where
+      to' = L℧A→LA⊎Unit'
+      to = L℧A→LA⊎Unit 
+      inv' = LA⊎Unit→L℧A'
+      inv = LA⊎Unit→L℧A
+      
+      P' = (section (to' (next to)) (inv' (next inv)))
+      P = section to inv
+
+      P'→P : P' → P
+      P'→P H x = (λ i -> fix-eq to' i (fix-eq inv' i x)) ∙ H x
+
+      sec' : â–¹ (section (to' (next to)) (inv' (next inv))) -> section (to' (next to)) (inv' (next inv))
+      sec' IH (η (inl b)) = refl
+      sec' IH (η (inr t)) = refl
+      sec' IH (θ la~) = λ i -> θ λ t -> P'→P (IH t) (la~ t) i
+      
+      sec : section L℧A→LA⊎Unit LA⊎Unit→L℧A
+      sec = transport (λ i → section (fix-eq to' (~ i)) (fix-eq inv' (~ i))) (fix sec')
+
+      Q'→Q : retract (to' (next to)) (inv' (next inv)) → retract to inv
+      Q'→Q H x = (λ i → fix-eq inv' i (fix-eq to' i x)) ∙ H x
+
+      is-retract' : â–¹ retract (to' (next to)) (inv' (next inv)) -> retract (to' (next to)) (inv' (next inv))
+      is-retract' IH (η a) = refl
+      is-retract' IH ℧ = refl
+      is-retract' IH (θ la~) = λ i → θ (λ t → Q'→Q (IH t) (la~ t) i)
+      
+      is-retract : retract L℧A→LA⊎Unit LA⊎Unit→L℧A
+      is-retract = transport (λ i → retract (fix-eq to' (~ i)) (fix-eq inv' (~ i))) (fix is-retract')
+
+  open FunctionalRel
+
+  _∽_ : L℧ ⟨ A ⟩ → L℧ ⟨ A ⟩ → Type (ℓ-max ℓ ℓ'')
+  _∽_ = functionalRelation L℧A→LA⊎Unit L℧A→LA⊎Unit LiftBisim._≈_
+  -- L℧ X ≡ Lift (X + 1)
+
+  open Inductive (next _≾_) public
+  open Properties public
+
+  prop-≾'→prop-≾ : BinaryRelation.isPropValued _≾'_ -> BinaryRelation.isPropValued _≾_
+  prop-≾'→prop-≾ = transport (λ i -> BinaryRelation.isPropValued (sym unfold-≾ i))
+
+  ord-prop' : ▹ (BinaryRelation.isPropValued _≾'_) -> BinaryRelation.isPropValued _≾'_
+  ord-prop' IH (η a) (η b) p q = A.is-prop-valued a b p q
+  ord-prop' IH ℧ lb (lift tt) (lift tt) = refl
+  ord-prop' IH (θ la~) (θ lb~) p q =
+    λ i t → prop-≾'→prop-≾ (IH t) (la~ t) (lb~ t) (p t) (q t) i
+
+  ord-prop : BinaryRelation.isPropValued _≾_
+  ord-prop = prop-≾'→prop-≾ (fix ord-prop')
+
+  ord-refl' : ▹ ((a : L℧ ⟨ A ⟩) -> a ≾ a) ->
+                    (a : L℧ ⟨ A ⟩) -> a ≾ a
+  ord-refl' IH (η x) =
+    transport (sym (λ i -> unfold-≾ i (η x) (η x))) (A.is-refl x)
+  ord-refl' IH ℧ =
+    transport (sym (λ i -> unfold-≾ i ℧ ℧)) tt*
+  ord-refl' IH (θ x) =
+    transport (sym (λ i -> unfold-≾ i (θ x) (θ x))) λ t → IH t (x t)
+
+  ord-refl : (a : L℧ ⟨ A ⟩) -> a ≾ a
+  ord-refl = fix ord-refl'
+
+  ord-antisym' : ▹ ((la lb : L℧ ⟨ A ⟩) -> la ≾' lb -> lb ≾' la -> la ≡ lb) ->
+                    (la lb : L℧ ⟨ A ⟩) -> la ≾' lb -> lb ≾' la -> la ≡ lb
+  ord-antisym' IH (η a) (η b) a≤b b≤a i = η (A.is-antisym a b a≤b b≤a i)
+  ord-antisym' IH ℧ ℧ _ _ = refl
+  ord-antisym' IH (θ la~) (θ lb~) la≤lb lb≤la i =
+    θ λ t -> IH t (la~ t) (lb~ t) (≾->≾' (la≤lb t)) (≾->≾' (lb≤la t)) i
+
+  ord-antisym : BinaryRelation.isAntisym _≾_ -- (a b : A) → R a b → R b a → a ≡ b
+  ord-antisym = transport {!!} (fix ord-antisym')
+
+  ord-trans : BinaryRelation.isTrans _≾_
+  ord-trans = {!!}
+
+ {-
+
+  prop-≈→prop-≃ : BinaryRelation.isPropValued LiftBisim._≈_ -> BinaryRelation.isPropValued _≃_
+  prop-≈→prop-≃ = transport (λ i → BinaryRelation.isPropValued (sym {!!} i))
+
+  bisim-prop : BinaryRelation.isPropValued _≃_
+  bisim-prop = {!!} -}
+      
+
+  𝕃 : DoublePoset ℓ ℓ' (ℓ-max ℓ ℓ'')
+  𝕃 = L℧ ⟨ A ⟩ ,
+    (dblposetstr (isSetL℧ A.is-set)
+      _≾_
+      (isorderingrelation ord-prop ord-refl ord-trans ord-antisym)
+      _∽_
+      (isper (functionalRel-refl L℧A→LA⊎Unit LiftBisim._≈_ (LiftBisim.Reflexive.≈-refl (A⊎1 .snd .is-refl-PER)))
+             (functionalRel-sym L℧A→LA⊎Unit LiftBisim._≈_ (LiftBisim.Symmetric.symmetric (A⊎1 .snd .is-sym)))
+             (functionalRel-propValued L℧A→LA⊎Unit L℧A→LA⊎Unit LiftBisim._≈_ (LiftBisim.PropValued.prop (A⊎1 .snd .is-prop-valued-PER)))))
+
+
+module LiftDPMorRel (A : DoublePoset â„“A â„“'A â„“''A) (B : DoublePoset â„“B â„“'B â„“''B) (R : DPMorRel A B â„“'') where
+  module LR = LiftRelation ⟨ A ⟩ ⟨ B ⟩ (DPMorRel.R R)
+  open LiftDoublePoset
+  open DPMorRel
+  
+  ℝ : DPMorRel (𝕃 A) (𝕃 B) ℓ''
+  ℝ = record {
+    R = LR._≾_ ;
+    is-prop-valued = {!!} ;
+    is-antitone = {!!} ;
+    is-monotone = {!!} }