List your position titles and general responsibilities, since not all those reading your resume will be familiar with all titles, and titles vary for different careers. For example, the title “IT Coordinator” in one firm could mean managing or directing IT, while in another firm it could be the person in charge of only the web site. Also, some titles do not reflect the extent of responsibility if they use terms like Assistant or Associate. An Associate Vice President is very different from a Research Associate; either one could be more influential than the other, depending on the industry. Or a Bookkeeper in one firm may only handle accounts payable, while a Bookkeeper in another firm may handle accounts payable and receivable, bank deposits and reconciliations, journal entries and petty cash.
That is why it is important to provide a brief description of the work you did under a specific title.