Ask for the libraries, and a contact person, where their system is installed. Most will provide at least five references. Remember vendors will be including their most satisfied customers. There is often a high turnover in sales staff. If a recent hire, the salesperson may not be as knowledgeable, nor as connected within the company, should special considerations arise.
Research vendors financial health through business reference sources.
An unstable company may be unable to provide future support for the system purchased today. Two hours are recommended for preliminary demonstrations. If the staff is extremely large, this could entail multiple demonstrations over 2-3 days. While this preliminary demonstration is in process, make note of what questions arise. Evaluation of Systems Include staff, from all aspects of service, to evaluate the proposed systems as to functionality for their particular needs.