The plan of action consists of looking at the Flat and any specification and making notes about what needs to be done, such as:
- determining many pattern pieces the design requires
- listing the pattern pieces
- making notes on what needs to be done for each pattern piece, or groups of pattern pieces (where relevant)
- doing any necessary calculations (e.g. how much needs to be added onto each pattern piece at the hem area)
Basically, you want to make sure you study the design and have everything you need to do laid out so that you don't overlook or forget anything. You then refer to these notes when creating the pattern pieces.
You can make all these decisions on the fly while making the pattern, but this can lead to some oversights and mistakes, even when there are minimal pattern pieces.
When you're starting out, it is a very good practice to get into making a plan of action.
Please be aware that the notes that write in real life are just jotted points; they don't have the level of details of the Plans of Action shown on this website. I am putting full explanations on the POAs on this site for people new to sewing and/or patternmaking who may not understand cryptic points.
To see examples of Plans of Actions, see any of the pattern instructions on this website; two of which are shown below: