Writing a specific function, class, or module to complete a larger program.

Depending on the file's contents, "developing a piece" usually means one of three things:

Look for logic that needs extending or debugging.

Check for instructions or a "README" that defines what needs to be developed.

Creating a report, chart, or insight (the "piece") from a database or spreadsheet.

The numbers in your filename might hint at specific technical contexts:

These might contain the "piece" of data you need to process or visualize.