Hello J,
Most likely the duration of the tasks (represented graphically by the
length of the Gantt chart bars) is decreasing because you are adding
resources to Effort Driven tasks. To turn off effort-driven, double
click on the task to show the Task Information dialog box, click the
advanced tab, and uncheck effort driven.
Check Help in MS Project for detailed information about the
effort-driven option and post back if you have any further questions.
I hope this helps. Let us know how you get along.
Julie
Project MVP
Visit
http://project.mvps.org/ for the FAQs and additional information
about Microsoft Project