At the following link I have discussed plan questions and given an example and the strategy for solving these plan questions.

Plan questions are quite frequent on the test and do require special treatment compared to a strengthen or weaken (but not too special).

The main difference is that plan questions do not have a conclusion in the stimulus. As discussed in the posting at the link below you can use an automatic conclusion for plan questions:

"The plan will achieve the goal" for strengthen or "the plan will not achieve the goal" for weaken. Simply define what the plan is and what the goal is and then you can find the answer choice that fits. These are generally strengthen or weaken questions and with the exception of the automatic conclusion above you can treat them the same way that you would other strengthen and weaken questions.

No need to learn fancy terminology just focus on the goal and the plan that is supposed to get there!

https://www.beatthegmat.com/strenghtenin ... tml#313159

Hope it helps!