Feedback, which may be a single grade, a checklist, or some other kind of progress indicator, tells students whether or not they are meeting objectives set by you, your program, or your administration. For both the CoWA and the CoSA, feedback to the student can be provided on the rubric sheet used to rate writing or speaking tasks. A sentence or phrase to summarize the performance provides an overall picture of the student's performance relative to the criteria outlined in the rubric. As with all rubrics, the criteria must be clearly defined. You will probably want to refine and revise your criteria as you refine your tasks until you come up with something that best meets your needs and those of your colleagues as well.
Revision is often easier when done collaboratively.
For example, if you plan that several teachers will try out your tasks with their students, you can meet as a group to discuss how well the tasks worked in terms of meeting your goals, and revise tasks and criteria according to the results you get.