The IPC 2020 only featured Hierarchical Task Network (HTN) planning, so all tracks were concerned with this hierarchical problem class.

Based on submitted benchmark domains and a questionnaire we offered the following tracks:

These are defined as follows:

Originally we also had a totally ordered track without recursion planned, though it was cancelled due to too few planner and domain submissions.

All problems are defined using the standard HDDL (an extension to PDDL that features task hierarchies). Please find more information in the Benchmarks section.

All tracks share common restrictions on the input: