This is a broader term than mIw. Like mIw, a ’atSuj is one part of a larger process or project, and most often consists of several subparts, each of which is a mIw. ’atSuj may also mean “chapter (of a book).” In this sense, it resembles ’ay’. A book’s ’atSuj may consist of a number of ’ay’mey, but a ’ay’ of a book, unless it refers to a major division, does not contain a ’atSuj.