Chapters 1 to 8: the accounting cycle, merchandising, inventory, internal control and receivables — with the two optional modules. It is one course, not three products. The same games are used either way — run all fifteen chapters and both optional modules as a full first-year course, or split them into two. The two optional modules attach to their parent chapter, so Accounting Theory and Special Journals both sit inside Accounting 1.
An optional module on the thinking behind the rules: why accounting exists and what makes its information useful. A separate set of 8 games you can include or leave out. It is not one of the fifteen core chapters and nothing later depends on it.
An optional module on the bookkeeping system a school accounting course teaches: special journals, subsidiary ledgers, and the periodic inventory method. A separate set of 6 games you can include or leave out. It is not one of the fifteen core chapters, and nothing in them changes — Chapters 5 and 6 still teach the perpetual method, and neither method is “wrong”.