Build and test the system. This should happen alongside early deployment as there are several interdependencies*. Key information you will need:
Pitfall: Waiting until the end of testing to set up workarounds
Complex manual workarounds may require a long setup time.
Solution: Watch for critical and major defects in the weeks leading up to the end of testing. Start to get workarounds ready well before testing ends.
Pitfall: Looking at workarounds in isolation.
This will mask where the same team is needed to execute multiple workarounds. They may not have the capacity for all of them.
Solution: Call out the resources needed and examine the combined list of workarounds and the aggregated effort.