It may be a good idea to flowchart out the users work flow and get them to approve it. If you get in the habit of flowcharting all the areas together, you can later include them in master flowchart document. Flowcharts are one of the best friends of a database designer. As you work on these sections, it's also a good time to work on the access documentation. You should define their access level and work on the password scheme accordingly.
Password documentation is a great asset on large projects with multiple users.
Superior password documentation can help you with this. I have found that password documentation along with a good macro utility can help make password changes a breeze with almost any level of complex database. The last things that you might want to log when you do this is the machine type the users are using, physical location, business manager and other business related activities. All trademarks are the property of their respective owners. Unauthorized reproduction in any form is strictly prohibited without prior permission.