Iowa Public Employees' Retirement System, Des Moines, will issue an RFP later this month for a general investment consultant for its $18.5 billion fund, according to a spokeswoman for the investment board. The RFP will be available on the system's website, www.ipers.org, in mid-April. The system placed incumbent Wilshire Associates on watch in February 2004. A system report in September raised concern about Wilshire staff departures, although the report found "Wilshire appears to be taking adequate measures to address and compensate for the turnover at the firm." Wilshire will be invited to rebid.