Making changes to forms after a study has already begun data collection brings up many important considerations. For example, deleting a field to replace it with another would delete any data that existed in that location. However, adding a choice to a choice field or renaming fields would not have any impact. 

For studies not using version control, changes can be made and applied instantly. This article focuses on studies that use version control and the steps to follow in making changes.

Forms can be changed as long as the study version is in development. That can be seen in the Form builder as shown below. When a version is in development, the red message below will not appear when that version is selected in the highlighted area:

If the highlighted area in the image above has no other choices, you will need to create a new version to develop. After doing so, that new version will appear as an option in the area shown above. Selecting the new version will ensure you are not working on the live study. However, it is important to keep track of any changes made to forms.

Any changes made will not affect subjects until such time that the newer version is published and subjects are migrated to it.

As long as the version is only in development, form changes and behavior can be tested on any Administrative site.