Book or project assignment?
It can be a little confusing whether you should use a book based assignment or a project based assignment, so here are some typical use cases.
Project assignments - use when you have a collection of assessments with no or minimal tutorial content. Best used for homework or lab type assessments. If a student is not going to regularly switch assignments in a single session.
Book assignments - use for tutorial content, examples and non-critical assessments. If students, when looking at one assignment, need to review content in another assignment, then a book is preferable as they can access all parts of the book if they need to.
You can mix both book and project assignments in a course module.