Question 5 of Assignment 1 requires an article from the ACM portal. However, full text of this article is not available to non-ACM members. Where are we meant to get this article?
My understanding is that the questions are based on the abstract for the article. Effectively your answers would be based on your interpretation of the literature review. Not much to go on, considering that the full article is not available, but I managed to answer the questions on the little info provided in the abstract. Hope it helps.