Assessment creators can organize questions into question pools so that they can reuse them. Question pools can be subdivided into subpools to organize questions by subject matter, section number, question type, or any other criteria desired. For example, an instructor can create a question pool called "Biology 105", and then create subpools called "Basic concepts", "Cell biology", and "Genetics".
The question pools you create will be accessible only to you in any course or project site for which you have permission to create assessments. For more information, see Can I share my question pools?