ground rule

a statement spelling out the proper procedure or conduct for an activity before the debate begins, let's lay out some ground rules Synonyms bylaw, rule, reg, regulationRelated Words code, constitution, decalogue, directory; act, law, ordinance, statute; behest, charge, command, commandment, decree, dictate, direction, directive, edict, fiat, instruction, order; axiom, fundamental, maxim, precept; moral, principle, value; ban, interdiction, prohibition, proscription, restriction; convention, custom, habit, manners, mores, practice (also practise), tradition, way; blueprint, canon, formula, guide, guideline, standard