Does anyone know of a module that can build a decision tree in a similar fashion to a workflow?

So you have something like:
Q1. How old are you?
A1. 6-12
.. Q2. Do you live within 1 mile of your school?
.. A1. Yes
.. .. Outcome: You qualify.
.. A2. No
.. .. Outcome: You do not qualify.

A2. 13-16
.. Q2. Do you have special educational needs?
.. A1. Yes
.. .. Outcome: You qualify.
.. A2. No
.. .. Outcome: You do not qualify.

A3. 16-18
.. Q2. Do you have special educational needs?
.. A1. Yes
.. .. Outcome: You qualify.
.. A2. No
.. .. Q3. Do you live within 1 mile of your school?
.. .. A1. Yes
.. .. .. Outcome: You qualify.
.. .. A2. No
.. .. .. Outcome: You do not qualify.

A4. 19-21
.. Outcome: You do not qualify.

I'm mainly concerned about the admin side, as I would like to write something in JavaScript that uses JSON to postback the answer and get the next set of questions to present.

I haven't seen an explicit decision tree module, however I know the userforms module can do some conditional logic, there was also a flowcharting module http://addons.silverstripe.org/add-ons/adrexia/flowchart that you could perhaps extend as the basis of your UI?

Hi Cam

Thanks for the suggestion however I've gone with a bespoke solution as after the initial planning I realised that it would only take a day to code.

Once again, thanks.

Seems to me like descion tree module could mean flowchart module - therefore I must add this as a suggestion regardless of wether you have a solution - https://github.com/adrexia/silverstripe-flowchart