What groups should participate in 401k Committee?

[Guest lmmangrum]

Does any have any good resource material outlining what groups/classes of individuals should be represented on a 401k committee? Its a privately owned corporation, and thankfully we do not have any employee unions. 95% of our employee base would be considered professional or highly skilled technical individuals. We have a committee that was created to direct/oversee the plan, however its all Accounting/HR individuals. Do I need to have "normal" employee representative whose involvement is not related to their job function (vs. HR Manager, Payroll Manager, etc).