https://community.appian.com/discussions/f/best-practices/40401/state-in-appianIs there any way in Appian to capture the previous state? I have a form with a couple of dop downs where the user selects different assignees for different tasks I want to able to send an email only to the changed users. Is there any way to compare olden-USTelligent Community 12https://community.appian.com/thread/154523?ContentTypeID=1Tue, 05 May 2026 14:47:22 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:b21c65b5-18bc-47fe-9da0-5cfd651234beelvisb958752<p>I cannot pass local variables to the process model. If i use the difference function the process model is gonna read them as null.</p><div style="clear:both;"></div>https://community.appian.com/thread/154521?ContentTypeID=1Tue, 05 May 2026 12:19:46 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:c93aaa8c-84c6-409c-96e3-b197fd52e6c3Stefan Helzle<p>The difference function allows you to compare two lists. Store the old selection to a local and compare it to the new on submit.</p><div style="clear:both;"></div>