Trigger a site workflow when a column changes

Question

I'm using Sharepoint Designer to craft a workflow that will do the following: When someone in a specific group enters a value in a field (i.e. the field is no longer empty) in one library, this workflow will run and do some validation and then change a value in another list. (The specifics aren't important, I don't think.)

I'm very confused as to whether the "Conditions" steps are triggers or rather things to look for when the workflow is eventually run. And I'm also not sure how the "If value equals value" construct can be massaged to do this.

Answer 1

The "Conditions" are not triggers, but are evaluated when the workflow runs to determine if the Steps within them should be executed.

For a SharePoint Designer Workflow, the only thing you can do is set the workflow to start when an item is added/updated and then check to see if the field is filled. If you only are allowed to change the other list the first time the field is changed, then you have to create some way of storing that this item has already been processed. This is most likely going to be a new column with just that purpose.