Planning means sticking on the specific idea during execution. It means working from inside out. It means first, figuring out what to achieve and configuring how things unfold and finally sticking on the same plan.
On the other hand, perceiving means seeing and acknowledging things that is happening in the present then working to understand the cause and finally responding to it. It means working from outside in. Perceiving is basically adapting to the present situation or being formless to adapt any circumstances.