Vet the Plan in PDSA

When we write the improvement cycle as linear, we start at P, which
places the emphasis on the plan (noun) you intend to implement. But
if P is understood to mean planning (verb), the emphasis is on
first constructing a plan. Thinking of the P in this way, it
becomes clear that you must first understand the current
circumstances and make an honest appraisal of what can be done,
given the way your organization works. In other words, when the
cycle starts at Study, your Planning is much more likely to result
in an ideal change - one that works and is workable to both address
the issue at hand and be feasible given the way work is done.
However, this leads to the question how much Planning should you
do?