diff --git a/src/model.ts b/src/model.ts
new file mode 100644
index 0000000..090ff87
--- /dev/null
+++ b/src/model.ts
@@ -0,0 +1,4 @@
+export interface Requirement { id: string; mandatory: boolean; title: string }
+export interface CaseResult { id: string; requirementIds: string[]; status: 'passed' | 'failed' | 'not-run'; evidenceUntil: string }
+export interface Gap { requirementId: string; reason: string }
+export interface TraceReport { covered: number; total: number; percent: number; gaps: Gap[]; orphanCases: string[]; duplicateCases: string[] }