A team delivers features each iteration and invites the customer to review after each iteration. The customer is often unavailable, delaying reviews and increasing rework. What should the project manager do?

The best approach is to proactively plan and agree upon a review process with the customer. This ensures their availability is considered and a mutually beneficial method for feedback is established, reducing delays and rework. Including the customer in daily activities might be excessive and impractical for their schedule. Asking for all requirements upfront for each iteration contradicts agile principles of iterative refinement and may not be feasible. Requesting reviews only when the customer is available is a reactive approach that will continue to cause delays and rework, as it doesn't address the root cause of their unavailability or the review process itself.