All TSIs are based on a standard TSI. A standard TSI is composed of a number of fixed selection levels and steps. The Personnel TSI, for example, consists of the Properties, Components, People, Visitors and Keys & keysets selection levels.

A TSI that is based on a standard TSI, cannot deviate from this standard and is composed of the same selection levels and steps. The order of the selection levels is also fixed. You can, however, disable selection levels, thus making them invisible to end users.