This list contains all specializations you working in. Work field is selected when you add a project or job. This list can be categorized to quickly finding necessary field.
To manage categories, click Manage categories.
When you select a work field somewhere in documents, you will be able to search by category or field name.
Specializations can be used to differentiate default rates and to build extensive reports - you can always get information about completed jobs in particular field using a number of build-in reports.