There is a plethora of different planning contexts. Strategy, technology, capacity, startup, pivot, program and project plans. Optimally, we have one approach for any.
This is possible in a question based approach.
Working from a handful of meta-questions, planning is a process of organizing chaos. The meta-questions include:
What are we interested in creating?
What's clear (known)?
What's unclear (unknown)?
What could we do to answer these questions?
What's optimal timing for our interests and actions?
This model guides us through any kind, scale and scope of planning in anything from the most to least predictable contexts.