To help manage various degrees of complexity in plans, the Manager adopts the notions Hierarchical Pedagogical Plan (HiPP) and Single-Node Pedagogical Plan (SNiPP).

** HiPPs are plans with a tree-like hierarchical structure. This structure is made up of one or more nodes called SNiPPs.

Each SNiPP is a pedagogical plan in its own right and may also have its own child SNiPPs. In other words, a SNiPP can be the root node of a HiPP, and a HiPP may embrace part of a plan or the entire plan.