Read upward. Everything starts at the foundation: regulatory text, cloud-vendor pricing pages, vendor PSIRT advisories — quoted verbatim, five times, by separate passes. Two tracks build on top: one for regulatory claims, one for cost numbers. They converge at L / I / B classification, where every finding is tagged Legally Required, Implicit Means, or Best Practice. Output: a deliverable that survives a hostile read.
Specialised methods when relevant — a six-dimension cost model (CPU · RAM · storage · bandwidth · quality · resilience) for media-heavy platforms where any single dimension misleads, and an adaptive-recording pattern (high-information segments stored at full fidelity, low-information stretches stored as compact derived data) where every minute must be retained but storage cannot scale linearly. Used to anchor codec, transport, and storage choices to multi-axis impact rather than a single metric.