Within three months of implementation of the program, all participating agencies in a county shall execute a written interagency agreement outlining their role in the program, including the duties they will perform, the duties other agencies will perform for and with them, and the categories of information to be collected and the plan for its distribution and use. All participating agencies will meet no less than once each month to plan, implement, and refine the operation of the program and to exchange information about individuals subject to the program or other related topics.