Hi Margaret, I work for Cornerstone OnDemand and would be more than keen to explain our perspective on what the key differences are between an LCMS and an LMS, if it helps ?
Here's a research paper we did on Learning Content Management a few years ago which you might find useful. We also have a lot of detailed information on functional frameworks and selection process which we use to support advisory projects. Hope the paper is helpful.
Elearnity - http://www.elearnity.com