I bet you missed what I think is an excellent study that included all the right players who help develop and write it: The 2008 Employer's Guide to Employee Assistance Programs
My only concern is that after 40 years, we are still arguing in this report about the definition of an employee assistance program. This was one of its recommendations and a sub-committee was formed to advance the answer. There lies the problem. Too many market forces "have had their way" with the definition of an EAP, to the point where the abuse of the original concept has nearly been lost. Too many different entities now claim rightful ownership to their own definition. How does one put this genie back in the bottle?