Understand APIs, business rules, permissions, integrations, background work, and operational evidence.
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Trail 1
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Identify which product rules must be enforced centrally even when a client or integration sends an unexpected request.
Trail 2
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Document each important endpoint's purpose, input, permissions, result, and failure responses.
Trail 3
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Express important rules once in a testable backend boundary rather than scattering them across screens and integrations.
Trail 4
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Design and test identity, resource-level permissions, and least-privilege roles as separate controls for every protected operation.
Trail 5
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Define ownership, retries, verification, failure handling, and provider exit for each critical integration.
Trail 6
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Move slow or retryable work into a queue only when the product can show status and safely handle repetition.
Trail 7
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Protect expensive and sensitive actions according to credible misuse, not with one arbitrary limit everywhere.
Trail 8
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Capture enough structured context to investigate failures without storing secrets or unnecessary personal data.
Trail 9
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Prefer a well-structured monolith until independent scaling, ownership, or release needs justify distributed operations.
Trail 10
What rule must hold even when someone bypasses the interface, repeats a request, or receives an external-service error? Require the proposal to explain boundaries, failure cases, evidence, ownership, and intentionally deferred controls.