SMA X NON ADHERENCE TO ATC CLRNC HAD NMAC WITH SMA Y. PLTDEV. SEE AND AVOID CONCEPT.

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SMA X; A STUDENT PLT; CALLED READY FOR DEP AT END OF RWY 35 FOR TOUCH AND GO ON THE PATTERN. I TOLD SMA X 'RWY 35; MAKE R CLOSED TFC; MAINTAIN AT OR BELOW 2000; CLRED FOR TKOF; TFC IS AN SMA ON 2 1/2 MI FINAL RWY 13.' SMA X ACKNOWLEDGED AND DEPARTED. MY ATTN WAS DIVERTED TO A GND SITUATION INVOLVING A PROGRESSIVE TAXI; I DID NOT SEE SMA X MAKE HIS XWIND TURNOUT. APPROX 30 SECONDS LATER; SMA Y ON THE ILS RWY 13 FINAL APCH COURSE; ADVISED HE HAD A NEAR MISS WITH AN SMA AND REQUESTED ITS LOCATION. THE PLT OF SMA X REPLIED HE WAS ON A L DOWNWIND FOR RWY 35. BOTH ACFT LANDED WITHOUT INCIDENT. A NUMBER OF FACTORS ENTERED INTO THIS NEAR MISS SITUATION. THE PLT OF SMA X DID NOT FOLLOW ATC INSTRUCTIONS TO ENTER R TFC; EVEN AFTER PERTINENT TFC WAS ISSUED. PLT SHOULD HAVE BEEN AWARE THAT A L TURNOUT OFF RWY 35 WOULD HAVE PUT HIS ACFT IN DIRECT CONFLICT WITH SMA Y. CTLR SHOULD HAVE ENSURED SMA X COMPLIED WITH ATC INSTRUCTIONS; ESPECIALLY CONSIDERING THE PROX OF ACFT INVOLVED AND MARGINAL WX CONDITIONS. INSTEAD; CTLR'S ATTN WAS DRAWN TO A SITUATION OF LESSER PRIORITY (GND CTL INSTRUCTIONS). THE UNIVERSITY FLT SCHOOL THE STUDENT IS ASSOCIATED WITH CONSTITUTES A LARGE NUMBER OF OPS AT THE ARPT; RELATIONS BTWN THE TWR AND SCHOOL ARE CLOSE. CONSEQUENTLY; I FEEL SOME COMPLACENCY ON MY PART CONCERNING THE PROFICIENCY OF THE STUDENT PLT LED ME TO DIVERT MY ATTN TO A LESSER PRIORITY. I ASSUMED THE PLT OF SMA X WAS CAPABLE OF UNDERSTANDING AND FOLLOWING ATC INSTRUCTIONS BASED UPON PAST EXPERIENCE. I LET MY GUARD DOWN AT A MOST INOPPORTUNE TIME. PRESENT DURING THIS INCIDENT WAS A DEVELOPMENTAL WHO WAS WATCHING THE LCL CTLR. HE WATCHED SMA X MAKE A L TURNOUT; WAS AT LEAST COGNIZANT OF A DEVELOPING CONFLICT; YET WAS UNSURE WHETHER HE SHOULD 'CHALLENGE' THE OPS OF AN FPL. INSTEAD; HE ASKED ME IF SMA X WAS SUPPOSED TO BE IN R TFC; AND I REPLIED AFFIRMATIVELY. IT NEVER STRUCK ME THAT SOMETHING WAS WRONG UNTIL AFTER THE FACT. HAD THE DEVELOPMENTAL SAID SOMETHING ABOUT L TFC; I MAY HAVE RESPONDED MUCH QUICKER TO THE DEVELOPING SITUATION.