# Previous Period
To add Previous Period (trend) data to your survey, please follow these steps:
1. From the Compass dashboard, click **Surveys**. \*Note the Surveys option is only available to your organizations Compass administrator(s).
2. Click on the title of the survey you would like to add previous period data to.
3. Click **Previous Period** in the left column.
4. Choose the survey that you will map data to from the dropdown list and add a mapping label (typically the year the last survey was done). Click **AutoMap** then **Continue**. Automap will do its best to match questions and demographic data from one survey to another.
5. Once loaded, you will be able to update the mapping of **Items** (survey dimensions and questions) and **Demographics** (data from your participant information file). To edit an Item or Demographic, click the dropdown icon and then pencil icon and choose which field(s) will be placed for the previous period survey.
6. The **Properties** tab allows you to update the mapping label, hide previous period data from reports, update the reporting column order (if you have created two previous periods), include the previous period data in heatmaps, and delete the mapping period entirely.
7. To add a second previous period, click **Add Second Mapping**, and then repeat steps 4 & 5.
8. You can switch between the two previous period surveys by clicking the dropdown just below the survey title.
