Which feedback source would NOT be optimal for improving an assignment?

The feedback source that would not be optimal for improving an assignment is one from a friend who is not familiar with the subject. Receiving feedback from someone who lacks knowledge about the topic can lead to misunderstandings or vague suggestions that might not address the specific requirements or nuances of the assignment. An uninformed perspective may overlook critical aspects that need attention or improvement, making their feedback less constructive.

In contrast, an instructor or teaching assistant possesses a deep understanding of the subject matter and the expectations for assignments, providing targeted and relevant feedback. A classmate can offer insights based on shared learning experiences, and a learning center tutor can provide expertise specific to the topic, enhancing the assignment's overall quality. Therefore, feedback from an unfamiliar friend lacks the necessary depth and specificity to be truly beneficial.