▁the ▁country : ▁Central , ▁Eastern , ▁Inter mount ain , ▁Northern ▁Inter mount ain , ▁Northern ▁Rock y ▁Mountain , ▁North west , ▁Rock y ▁Mountain , ▁and ▁Western . ▁The ▁divisions ▁provide ▁on - the - ground ▁services ▁to ▁the ▁members ▁in ▁their ▁specific ▁part ▁of ▁the ▁country ▁and ▁support ▁their ▁local ▁members ▁through ▁education , ▁cert ification , ▁and ▁P SI A - A AS I ▁membership ▁services . ▁In ▁addition , ▁P SI A - A AS I ▁represents ▁the ▁United ▁States ▁to ▁the ▁rest ▁of ▁the ▁world ▁through ▁the ▁International ▁Ski ▁Inst ruct ors ▁Association . ▁ ▁M emb ership ▁Currently ▁there ▁are ▁four ▁primary ▁categories ▁of ▁membership ▁in ▁P SI A - A AS I : ▁Register ed , ▁Level ▁I , ▁Level ▁II , ▁and ▁Level ▁III . ▁New ▁instruct ors ▁first ▁become ▁a ▁registered ▁member ▁and ▁then ▁train ▁for ▁and ▁are ▁exam ined ▁at ▁Level ▁I . ▁Level s ▁II ▁and ▁III ▁progress ively ▁require ▁more ▁depth ▁of ▁knowledge , ▁skill ▁at ▁applying ▁this ▁knowledge , ▁and ▁demonstr ation ▁of ▁a ▁greater ▁range ▁of ▁sl iding ▁skills ▁on ▁progress ively ▁more ▁difficult ▁terrain ▁and ▁snow ▁conditions . ▁ ▁History ▁With ▁a ▁goal ▁of ▁establish ing ▁and ▁prom oting ▁standards ▁for ▁how ▁ski ing ▁was ▁taught ▁in ▁the ▁United ▁States ▁P SI A ▁was ▁incorpor ated ▁in ▁the ▁fall ▁of ▁ 1 9 6 1 ▁by ▁a ▁group ▁of ▁seven ▁committed ▁instruct ors : ▁Bill ▁L ash , ▁Jimmy ▁John ston , ▁Paul ▁Val ar ,