A slot is the basic element of the Scheme. It serves as a placeholder for events (Programs and series episodes) and has a certain begin and end. Slots are generated with a certain slot type and can be linked with further slots (predecessors and successors) linked by connectors. Each slot can be assigned with commercial breaks (=ad breaks) and service information (SI-Information).

A slot represents a certain hierarchy level in the Planner - it can contain blocks, events and ad breaks.