Specify what you hope to achieve by purchasing a Learning Management System.
Let the LMS vendors know your expectations for the project. What are you trying to achieve with your new LMS and training strategy? What are your learning goals and objectives? This doesn't have to be in great detail, as you will be explaining this at great length in the LMS RFP, but you will want to be as clear as possible when describing what areas you're trying to develop or improve within your organization.