Tops Down = Definition, Bottoms Up = Evaluation

The Product Strategy Stack is a system we can use for both planning and execution:

Tops Down: Teams can work from the top of the stack down to 1) define the stack, 2) work at a progressively finer level to plan product execution, and 3) align the company to that execution plan.

Bottoms-Up: In addition, teams can work bottoms-up to 1) communicate the status of execution and 2) track how well the product team’s work is driving company-level objectives.