Illinois Municipal Retirement Fund, Oak Brook, plans to conduct an asset/liability study between April and June, followed by an asset allocation study, said Louis W. Kosiba., executive director of the $24.2 billion fund. Ennis Knupp, the funds investment consultant, will do the asset/liability study with Gabriel Roeder Smith, the funds actuarial consultant, he said. Ennis Knupp will also do the asset allocation study, which Mr. Kosiba said could be completed in the third quarter when recommendations would be presented to the funds board. He said its too early to consider any new asset classes in the allocation study, he said. The last asset/liability study was in 2005, Mr. Kosiba said. The funds current allocation is 39.3% domestic equity, 34.8% fixed income, 18.7% international equity, 3.9% alternatives, 2.7% real estate and 0.6% cash.