A/B testing with multipage forms v. single page forms

I've been using a single page screen of a form that has 5 required elements and a lot of optional elements. The required elements are grouped at the top of the form and the introduction lets them know they don't need to complete everything to proceed.

I'm wondering if there is a way to actually measure abandon rate with a single page screen - we view the form, too, once they've completed it, and also make notes on elements only visible to us. If I could determine an abandon rate, I could actually measure the impact of going to a multiplage form. I have seen posts on capturing email addresses and minimizing the number of fields on the form, and also one on the effectiveness of multipage forms.

Has anyone found a way to measure abandon rate?

Some details - the people completing the form are anonymous users (not logged in), so there is no opportunity to have them come back and fill in more details. I've worked with sending them to another page after submitting their entry, and that only seems to work if the All Done button is active (in preferences and for the form). The general users seemed to have more difficulty when they had 2 buttons to deal with.

Thanks in advance!
Steve

Comments

Options for form tracking and abandonment rate

Over at the ImpressCMS forums - http://community.impresscms.org/modules/newbb/viewtopic.php?viewmode=flat&type=&topic_id=5907&forum=9

The GTM (Google Tag Manager) solution looks promising. The other script that uses GTM adds even more analytic information about individual fields on the forms.