ACR-LGT FLT CREW MISSED ALT CHANGE AND CTLR MISSED ERROR IN READBACK RESULTING IN LESS THAN STANDARD SEPARATION WHEN ACR-LGT CLIMBED THROUGH ALT OF SMA.

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AS THE RADAR CTLR; I WAS WORKING THE S DEP SECTOR AT PHX TRACON. I HAD AN IFR SMA WBOUND IFR CLBING TO 10000' MSL. TWR CALLED OFF 2 ACRS; #1 ON A STANFIELD DEP; #2 ON A MOBIE DEP VISUAL ON #1. ALL 3 ACFT DEPARTED RWY 26. THE FIRST ACR CHKED IN PROFESSIONALLY WITH AN ALT LEAVING AND AN ALT CLBING TO ('ONE-SIX-THOUSAND'). I TOLD ACR #1 TO AMEND ALT TO MAINTAIN 6000' WHICH THE PLT READ BACK. SMA X WAS OUT OF 7000'; SO ACR #1 WOULD PASS BELOW. ACR #2 RPTED AIRBORNE NONPROFESSIONALLY WITH HIS ALT LEAVING (SAYS NOTHING ABOUT ASSIGNED ALT [16000']). I TOLD #2 TO MAINTAIN 6000'. CREW READ BACK SLIGHTLY GARBLED BUT 6000' WAS RECEIVED. #2 CLBED THROUGH THE ALT OF SMA X CAUSING LOSS OF IFR SEP. CONTRIBUTING FACTORS: ACR #2 INITIALLY ASSIGNED 16000'. I INSTRUCTED #2 TO MAINTAIN 6000' W/O SAYING AMEND ALT. #2 DID NOT; ON INITIAL CONTACT; ADVISE HIS ALT CLBING TO. WHEN THE PLT READ BACK CLBING TO 16000'; I DID NOT HEAR THE '1' AND IT IS EXTREMELY GARBLED ON THE TAPE. BOTTOM LINE: MY FAILURE TO NOT SAY 'AMEND ALT' AND THE CREW HAVING AN ASSIGNMENT OF 16000' BUT NOT ADVISING ME. CORRECTING THE PROB: HAVE MANDATORY STANDARD PHRASEOLOGY FOR PLTS AND CREW JUST AS FOR CTLRS. THE PLT BEARS ABSOLUTELY NO RESPONSIBILITY FOR BEING REQUIRED TO HEAR ME CORRECTLY. THE CTLR IS ULTIMATELY RESPONSIBLE THOUGH TO HEAR THE PLT'S CORRECT READBACK. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR HEARD THE TAPE OF THIS INCIDENT SHORTLY AFTER HE WAS REMOVED FROM HIS POS FOR RECERTIFICATION. HE ADMITS THAT THE READBACK FROM THE #2 ACR WAS FOR AN ALT OF 'ONE SIX THOUSAND;' AND HE MISSED THE 'ONE.' HIS STATEMENT THAT HE WAS BEING TRANSFERRED TO A VFR LEVEL II TWR FOR HAVING THIS SYS ERROR WAS NOT CORRECT. HE SAID THAT THIS INCIDENT WAS HIS THIRD IN 2 YRS AND HE TOLD FAC MGMNT THAT HE WOULD PREFER TO TRANSFER TO THE VFR TWR IF THEY PLANNED AN EXTENDED PERIOD OF 'HUMILITY TRNING.' SUCH WAS NOT THE CASE; AND HE WAS RETURNED TO DUTY AFTER RECERTIFICATION TRNING WAS COMPLETED.