Note any assumptions built (you may not have all the data you'd like so some assumptions could be essential e.g.: "It has been assumed that…", "Assuming that it will require half an hour or so to read 1 doc…"). This chapter is yet another interesting and more simple subject matter https://hbr-case-study-writing-he39722.pages10.com/5-simple-statements-about-hbr-case-study-solution-explained-65473545