For organizations that use agile planning techniques there are the following system preferences that can be set by visiting the general option in set up.
Work name
The work name field is shown in the work details panel and can be used to describe the work entered in more detail. If you are using agile, you may want to set this to story.
Default work input style
Set this to agile if you want new work added to default to agile. Agile work lets you select a sprint and enter work estimates in story points or days.
Default work entry type
This is used when new work is added to determine how the estimate is entered. If you are using agile, you may want to set this to story points. However, this can be overridden at the work level.
Default work dates to sprint dates
Ticking this option on will cause any work added to default to use sprint dates.