Configuration: Win XP Pro; Project 2003 Standard
Project parameters: Using standard calendar customized with 6-hour workdays. Each (human) resource has a custom calendar with vactation days. All tasks are set up to be completed "as soon as possible" and are "Fixed Units" and "Effort Driven."
Problem: Each resource's tasks should be automatically arranged sequentially so that the person is not tasked for more than 6 hours per work day. Instead, Project left all tasks for each resource on the same day, resulting in hundreds of hours of work associated with a single person on a single day.
Attempted resolution: I used resource leveling. This worked for one person's tasks, but not for anothers. One person's tasks are still concurrent (all on the same day). Project recognizes this as over-allocation of work to that resource, but provides no effective hints for how to resolve it.
Additional information: I don't want to set up explicit dependencies for each resource's tasks because task assignments are subject to change. Project is supposed to be able to do the task sequencing automatically (The Complete Idiot's Guide to Project Management with Microsoft Project 2003, p. 149).