A defensible decision compares what each path costs from today to the same target and tests the uncertainty most likely to change the choice.
Define the same target for every path
Write the capabilities, operating conditions, quality constraints, required integrations, data obligations, delivery horizon, and ownership model the system must reach. Repair and rebuild estimates are incomparable when one preserves today's scope while the other silently includes a redesigned product. Separate required outcomes from optional improvements and future ideas.
Include retire, replace with a service, retain temporarily, or selectively rebuild when they are plausible. AWS publishes distinct strategies such as retain, retire, replatform, and refactor because modernization is not one binary choice. The useful comparison names which target requirements each path meets, defers, changes, or cannot satisfy.
Separate foundational faults from surface faults
Trace repeated incidents, blocked changes, failed migrations, test gaps, dependency constraints, data coupling, deployment friction, and ownership gaps to the structure that produces them. A visible bug can be surface-level even when it recurs. A simple feature can reveal a foundational boundary when every change crosses the same unsafe state or manual recovery path.
Record evidence and counterevidence for every fault. Mark whether a bounded repair can isolate it, whether the target requires architectural change, and which assets remain valuable under either path. Do not use code age, aesthetic preference, or prior effort as a verdict. They may affect forward work, but they do not decide it by themselves.
Test the decision-sensitive assumption
Find the uncertain premise whose answer could change the path: whether a data boundary can be separated, a dependency can be replaced, a clean deployment can run, a critical workflow can be reproduced, or a key asset can survive. Build the smallest proof with acceptance, stop, time, cost, evidence, and reversal conditions written beforehand.
Forward Cost Dossier is prepared through Reality Contact, LLC. The buyer owns the target, estimates, risk tolerance, funding, and final choice. The framework does not certify security, cost, schedule, or delivery success. It makes assumptions, evidence, path constraints, and reversibility inspectable before the buyer commissions implementation separately.
Where the service stops
Reality Contact, LLC prepares technical decision evidence but does not certify security, compliance, reliability, valuation, delivery dates, or cost estimates; it does not give legal, investment, accounting, or procurement advice and does not guarantee that any selected path will succeed. The buyer defines the target state and constraints, supplies authorized evidence, challenges assumptions, approves the proof, chooses the path, assigns funding and owners, and commissions any repair, rebuild, selective replacement, or retirement under a separate scope. This technical decision service does not replace security, compliance, legal, accounting, investment, procurement, product, data, architecture, or production-operations review. The buyer owns the target state, estimates, constraints, proof authority, funding, staffing, implementation scope, and final repair, rebuild, selective replacement, retirement, or observation decision.
Sources: AWS application migration strategies; AWS wave-based modernization discovery and analysis.