Portfolio - a large, flat, skinny case for carrying free papers or drawings or maps; commonly leather; "he remembered her simply because she was carrying a considerable portfolio" A case study is an in depth evaluation of just one subject matter, for instance a individual, team, function, organisation, or phenomena. https://rafaelebncg.blogocial.com/the-definitive-guide-to-hbs-case-study-assignment-help-72025580