diff --git a/contracts/epistemics/truth.go b/contracts/epistemics/truth.go
index b791643..2702a9d 100644
--- a/contracts/epistemics/truth.go
+++ b/contracts/epistemics/truth.go
@@ -1,5 +1,7 @@
 package epistemics
 
+import "git.cin.su/m/Assistant/platform/ids"
+
 type BeliefState string
 
 const (
@@ -9,19 +11,27 @@ const (
 )
 
 type Observation struct {
-	ID             ObservationID
-	SourceSnapshot SourceSnapshotID
-	Excerpt        SourceExcerptID
-	Text           string
-	ObservedAt     int64
+	ID              ObservationID
+	SourceSnapshot  SourceSnapshotID
+	Excerpt         SourceExcerptID
+	Text            string
+	ObservedAt      int64
+	PrincipalID     string
+	ContextScopeRef string
+	ObservationKind string
+	Payload         string
+	ExtractorRef    string
 }
 
 type Claim struct {
-	ID            ClaimID
-	Statement     string
-	ObservationID ObservationID
-	CitationID    CitationID
-	Verification  VerificationState
+	ID                   ClaimID
+	Statement            string
+	ObservationID        ObservationID
+	CitationID           CitationID
+	Verification         VerificationState
+	PropositionID        ids.ID
+	RevisedFrom          *ClaimID
+	RecordedAtUnixMillis int64
 }
 
 type Belief struct {
diff --git a/contracts/epistemics/types.go b/contracts/epistemics/types.go
index 2927aed..34abbcd 100644
--- a/contracts/epistemics/types.go
+++ b/contracts/epistemics/types.go
@@ -24,6 +24,8 @@ type HelpMethodKind string
 type OutcomeClass string
 type ReflectionTriggerKind string
 type ReflectionCandidateState string
+type PropositionKind string
+type BeliefAssessmentState string
 
 const (
 	VerificationUnverified    VerificationState = "UNVERIFIED"
@@ -73,6 +75,12 @@ const (
 	ReflectionCandidateEvaluating ReflectionCandidateState = "EVALUATING"
 	ReflectionCandidateSuperseded ReflectionCandidateState = "SUPERSEDED"
 	ReflectionCandidateResolved   ReflectionCandidateState = "RESOLVED"
+	PropositionWorldFacet         PropositionKind          = "WORLD_FACET"
+	PropositionWorldRelation      PropositionKind          = "WORLD_RELATION"
+	PropositionOwnerDefined       PropositionKind          = "OWNER_DEFINED"
+	PropositionTextual            PropositionKind          = "TEXTUAL"
+	BeliefAssessmentCurrent       BeliefAssessmentState    = "CURRENT"
+	BeliefAssessmentSuperseded    BeliefAssessmentState    = "SUPERSEDED"
 )
 
 // SystemExpectation records what Domovoy expected a meaningful help path to
@@ -134,3 +142,24 @@ type ReflectionCandidate struct {
 	ClaimedBy                string
 	ClaimExpiresAtUnixMillis int64
 }
+
+type Proposition struct {
+	ID           ids.ID
+	Kind         PropositionKind
+	SubjectRef   string
+	PredicateRef string
+	ObjectValue  string
+	ObjectRef    string
+	Qualifiers   []string
+	TextFallback string
+}
+
+type BeliefAssessment struct {
+	ID                   ids.ID
+	ClaimID              ClaimID
+	Revision             ids.Revision
+	State                BeliefAssessmentState
+	ConfidenceMillis     int64
+	EvidenceRefs         []EvidenceRef
+	AssessedAtUnixMillis int64
+}
diff --git a/dev/ACTIVE_TASK.json b/dev/ACTIVE_TASK.json
index 7f35a38..1aeb56a 100644
--- a/dev/ACTIVE_TASK.json
+++ b/dev/ACTIVE_TASK.json
@@ -1 +1 @@
-{"task_file":"dev/tasks/GEN2-005-world-identity-resolution-and-version-environment-bindings.json","task_id":"GEN2-005","task_revision":1}
+{"task_file":"dev/tasks/GEN2-006-normalize-epistemics-evidence-propositions-claims-and-belief-assessments.json","task_id":"GEN2-006","task_revision":1}
\ No newline at end of file
diff --git a/modules/epistemics/domain/knowledge_v2.go b/modules/epistemics/domain/knowledge_v2.go
new file mode 100644
index 0000000..4b2966a
--- /dev/null
+++ b/modules/epistemics/domain/knowledge_v2.go
@@ -0,0 +1,36 @@
+package domain
+
+import (
+	"errors"
+	"git.cin.su/m/Assistant/contracts/epistemics"
+	"git.cin.su/m/Assistant/platform/ids"
+	"strings"
+)
+
+var ErrInvalidKnowledge = errors.New("invalid epistemic knowledge record")
+
+func ValidateProposition(value epistemics.Proposition) error {
+	if value.ID == "" || value.Kind == "" || strings.TrimSpace(value.SubjectRef) == "" || (value.ObjectValue == "" && value.ObjectRef == "" && value.TextFallback == "") {
+		return ErrInvalidKnowledge
+	}
+	return nil
+}
+
+func ValidateBeliefAssessment(value epistemics.BeliefAssessment) error {
+	if value.ID == "" || value.ClaimID == "" || !value.Revision.Valid() || value.State == "" || value.ConfidenceMillis < 0 || value.ConfidenceMillis > 1000 || value.AssessedAtUnixMillis < 1 {
+		return ErrInvalidKnowledge
+	}
+	return nil
+}
+
+func NewBeliefAssessment(claim epistemics.ClaimID, confidence int64, state epistemics.BeliefAssessmentState, evidence []epistemics.EvidenceRef, at int64) (epistemics.BeliefAssessment, error) {
+	id, err := ids.New()
+	if err != nil {
+		return epistemics.BeliefAssessment{}, err
+	}
+	value := epistemics.BeliefAssessment{ID: id, ClaimID: claim, Revision: ids.InitialRevision, State: state, ConfidenceMillis: confidence, EvidenceRefs: append([]epistemics.EvidenceRef(nil), evidence...), AssessedAtUnixMillis: at}
+	if err := ValidateBeliefAssessment(value); err != nil {
+		return epistemics.BeliefAssessment{}, err
+	}
+	return value, nil
+}
diff --git a/modules/epistemics/domain/knowledge_v2_test.go b/modules/epistemics/domain/knowledge_v2_test.go
new file mode 100644
index 0000000..e297e81
--- /dev/null
+++ b/modules/epistemics/domain/knowledge_v2_test.go
@@ -0,0 +1,22 @@
+package domain_test
+
+import (
+	"git.cin.su/m/Assistant/contracts/epistemics"
+	"git.cin.su/m/Assistant/modules/epistemics/domain"
+	"testing"
+)
+
+func TestKnowledgeV2SeparatesPropositionAndReassessableBelief(t *testing.T) {
+	p := epistemics.Proposition{ID: "p", Kind: epistemics.PropositionWorldFacet, SubjectRef: "world:database:a", ObjectValue: "1.6.28"}
+	if err := domain.ValidateProposition(p); err != nil {
+		t.Fatal(err)
+	}
+	a, err := domain.NewBeliefAssessment("claim:a", 800, epistemics.BeliefAssessmentCurrent, []epistemics.EvidenceRef{"observation:a"}, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	a.Revision++
+	if err := domain.ValidateBeliefAssessment(a); err != nil {
+		t.Fatal(err)
+	}
+}