We have been working on the issue of supporting Itemsets / Cascading Selection. The idea being that you would like to ask a question, and then use that answer to filter the available options for the next question. The most common use of this is asking what State you are from, then the next question is what City you are from, available options are filtered by State, so you only see Cities in your State.

Mobile digital data collection application now available in the Android Market. Based on the Open Data Kit, KoBo Collect can be used to conduct face to face interviews, take data of any type, or perform monitoring and evaluation of ongoing programs.