Chartable
At your project home page mapping interface (further details here) we provide the facility to display bar charts or pie charts of the data you collect. If you check the Chartable checkbox it means that you wish to be able to display the data collected for this form element as a chart.
Note: Currently you can choose a maximum of three form elements for charting. Also note, that charting will work best for 'Select One' and Select Multiple' form elements where you can specify the choices to be made