Stacey is ’s control manager at the plant. Even before arrives, Stacey recognizes that the plant’s steadily-growing inventory is problematic. When Alex wants to implement Jonah’s principles and change the way they manufacture, particularly regarding , Stacey is very receptive to the change. During meetings, she often contributes ideas and insight, including helping Alex refine his tagging system for bottleneck parts. When Alex becomes the division manager and moves up to plant manager, Stacey steps into Bob’s former role as the production manager so that she can devise new protective measures to keep the plant’s flow from faltering.