A task is an activity that is performed by one worker for a period of time in order to achieve a goal of your project .
You organize your project's work by creating an outline of tasks and summary tasks. That is, a task can be a subtask of a summary task and a summary task can be a subtask of another summary task.
For example, suppose you are planning to build a raised vegetable bed. The high level summary tasks might be Prepare site, Purchase materials, Prepare site, etc., with various individual tasks, as shown in the outline below.
If you have a helper, then you should assign some of these tasks to yourself and the others to your helper.
Some of these tasks depend on other tasks. For example, you can't build the frame until you've purchased the lumber at the hardware store. Therefore, when defining the "build wooden frame" task you say that it depends on the "go to hardware store" task. In PlanIt9 any task can depend on any number of other tasks.
Every task has a priority, with 1 being the highest. Tasks are scheduled automatically by PlanIt9 taking into account their priority and dependencies.