# Indicator sources

Indicator sources define the set of records to evaluate when collecting indicator scores.

Indicator sources are based on a facts table, such as Incident, and may specify filter conditions to limit the included records. One indicator source can be used by multiple indicators.

Typically, the indicator tracks the situation on a certain date. The conditions should include a date-related filter, such as [Opened][on][Today]. Indicators collected less frequently might specify a larger date range, such as [Closed][on][This month].

Create indicator sources carefully. Since multiple indicators may be linked to an indicator source, it is not easy to change the indicator source after you created it.

Note: Indicator sources must be created before you can create an indicator.