Michigan Compiled Laws, Chapter 38. Civil Service and Retirement § 38.2108

Sec. 108. (1) “Plan 1 member” means a member or vested former member who is or was the governor, lieutenant governor, secretary of state, attorney general, or legislative auditor general.

(2) “Plan 2 member” means a member or vested former member who is or was the constitutional court administrator, a justice of the supreme court, or a judge of the court of appeals.

(3) “Plan 3 member” means a member or vested former member who is or was a judge of the circuit court, judge of the recorder's court of the city of Detroit, judge of the district court, except a judge of the thirty-sixth district described in subsection (8), or a judge of the probate court, except a judge of the probate court described in subsection (7), (9), or (10).

(4) “Plan 3a member” means a member or vested former member described in subsection (3) who does not convert any of the salary standardization payment under section 504  1 or sections 14a and 14c of former 1951 PA 198.  2

(5) “Plan 3b member” means a member or vested former member described in subsection (3) who converts $2,250.00 of the salary standardization payment under section 504(1) or section 14a of former 1951 PA 198.

(6) “Plan 3c member” means a member or vested former member described in subsection (3) who converts the balance of the salary standardization payment under section 504(2) or section 504a  3 or section 14c of former 1951 PA 198.

(7) “Plan 4 member” means a member or vested former member who is or was a judge of the probate court serving in a single county of less than 15,000 population.

(8) “Plan 5 member” means a member or vested former member who is or was a judge of the district court in the thirty-sixth district.

(9) “Plan 6 member” means a member who on the day before the effective date of this act was a member or vested former member of the former probate judges retirement system, who may be a member of a county retirement plan, and who is under the 3% benefit formula provided by section 16(l)(a), (b), and (c)  4 of former 1954 PA 165.  5

(10) “Plan 7 member” means a member who on the day before the effective date of this act was a member or vested former member of the former probate judges retirement system, who is not a member of a county retirement plan, and who is under the 3.5% benefit formula provided by section 16(1)(d) of former 1954 PA 165.