Pure-reference catalog of James Bach's FCC CUTS VIDS heuristic - a 10-letter mnemonic for the dimensions a tester catalogs when MODELLING a system: Format, Constraints, Connections; Coverage, Users, Tasks, Sequences; Variables, Inputs, Data, Storage. Use pre-session to build the system model a charter will explore. For what to VARY use sfdpot-exploratory-heuristic, for oracles (is it a bug?) use hiccupps-f-heuristic, for quality criteria use crusspic-stmpl-heuristic.