The design recipes are evolving as we learn how to code more complicated functions in Scheme.
As you saw in lecture on August 30, we now need data analysis for some functions that we write. On that date in lecture, the example showed that data might be such that it can be logically be grouped into different categories or ranges. When that is the case, we need to document that fact in the Design Recipe and namely in the "Data Analysis" section.
Also, in HW4 we require the use of named constants for at least one of the problems. For now, put declarations of constants under the "Data Analysis & Definitions" portion of the function in question.