Hi @miri.blair ,
It is not necessary, but I recommend students follow the directions and describe how their artifact illustrates the innovation's purpose/effect. This is to help with Row 1, which requires the artifact illustrate the innovation's purpose/effect. In case it is unclear to the reader how the student's artifact illustrates the innovation's purpose/effect, the reader can use written response 2a to help them understand.
A good example would be student sample C (from the list of samples: https://apcentral.collegeboard.org/courses/ap-computer-science-principles/exam?course=ap-computer-science-principles#anchorSG)
As a reader, I might see this artifact and think "um, ok, it's just pictures of GPS..."
Luckily, the student's written response 2a includes "The artifact demonstrates the several functions of the GPS within the various pictures and some of the components involved with the functionality of the device. " so as the reader I now think "ohhh ok, I see what you did there..."