You are managing a project to design microprocessor control systems.

The design work was estimated to be complete in 3.5 months with seven milestones. The sixth milestone is the prototype to be transferred to manufacturing. All milestones before prototyping have been completed ahead of schedule, with the sixth one being delayed for four months because the prototype was sent back several times due to conflicts between departments. You are now planning to hold a meeting to review the design specifications and handle conflicts between design and manufacturing. Who is at fault?

The scheduler The project manager The manufacturer The design engineer