R.I. Gen. Laws § 36-10.2-4: Actuarial valuation methodology.

Actuarial accounting methods used by the actuary in determining the funded percentage shall be determined by the board in compliance with all applicable public pension accounting laws, rules and regulations. The actuary or the board shall not, year to year, change actuarial methods for the sole purpose of achieving a more favorable funding or fiscal result. Any actuarial assumptions not determined by the board shall be made by the actuary in good faith and in accordance with accepted actuarial standards.