As to the concept of J, we find two often mentioned activities: planning and deciding.
As much as the planning gets associated with J, much planning is done by the real-life P architect, urban planner and the civil engineer. Much planning is done by the WoW Raid player, someone constructing their newest home computer, and anyone trying to finish half triathlon with killer time. Greatly P sport players practice and plan their moves tirelessly. Or, you could argue they never "plan" - what do they do, then?
Decisions, what are they? Deciding where to eat? What education to take? What purchase to make? Can we then imagine a "decisive" person who decides where to eat each and every time, expresses their firm assurance over the education they've recently started, and saves money to make expensive purchases? Doesn't everybody do something, and aren't actions a consequence of some kind of a decision, forced or natural?
In MBTI-talk, is "decisive" just someone who intrudes others with their decisions? Or is it someone who declares their decision on something, and appears to keep his/her mind about it? Is it someone who maintains their stated goals despite opposition?
What do you make of these concepts?
Could they be made less ill-defined?