You can group related tags into groups and present them in a list from which reviewers can choose as they mark items. This facility is optional, but it offers a number of benefits:

• The number of tags that you can create is unlimited, and in theory reviewers can have a hundred or more tags from which to choose. Grouping related tags imposes some structure and makes display and selection less of an issue for the reviewer.

• Tag groups provide an indication of the use of the tags. For example, by grouping key tags into a group that is called "Important Tags for Matter x", you offer a clue about the function of the tags.

• You can use a tag group to present reviewers with a question, such as "Which customer does this item apply to?", and then have them answer the question by choosing between suitably labeled tags.