The process of creating and editing a tag system is the same for all objects in Ada: items/assets, examinees, tests, and sessions. However, they are separated because you will not likely use the same tagging systems for each of these. For Items, you will likely use educational curriculum/standards, such as Common Core State Standards in the USA. For Tests and Sessions, you might also use aspects of the curriculum (subjects like Math and Biology) but also tag them with totally unrelated variables (e.g., School Year, Semester, or Delivery Format).
Because they are separated, you will see a list of these objects in the side-navigation menu of the Tags module, but the interface inside each of these is the same.
When you click on one of these objects, you'll see a list of tag groups you have created for that object. A Tag Group refers to a group of related tags; Ethnicity is an example of a Tag Group, and it might have possible tags of White, Hispanic, Asian, Black, and Other/Prefer Not to Say. IMPORTANT: each Tag Group can be a deep hierarchy and not just a few tags at the same level. For example, you can create a Tag Group for a school hierarchy, which is District/School/Teacher/Section (4 levels deep) and still orthogonal to Ethnicity.
To create a Tag Group, click the red Add Group button in the upper right. Click on the + to add your first tag.
You can continue clicking the + button at the top level of the hierarchy to add more first-level tags, but as you create these, they will have their own + buttons to create second-level tags underneath them. Keep going, and you can start creating a school hierarchy, as shown below. This district has 3 schools so far; 4 teachers have been added to East Great Falls High School but none to Bailey Elementary or Riverside Middle School yet.