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This list contains all work types you perform for your clients. It could be translation, proofreading, DTP, etc.
Service type is used when you add a new detail row to the project. When setting default rates, you can select different service types as the basis for the rate. For example, translation usually counted on per-word basis, while proofreading tasks are counted on per-hour basis.
You can select Default unit for each service type. This unit will be automatically pre-selected during creation of tasks in translation jobs.
In addition to setting default rates, work types are used to calculate different stats of your performance.