Hi
     Today's class about how we categotise each headings for a questionaire which includes demography and socio- economic profile, environmental, nutritional, health status, maternal and child health, utilisation of available facilities.  Over all we divide them into four headings which gives us an overview of the particular villages problem- health problems , social problems , environmental problems , other problems.  Then we discussed about open ended question(open question), closed ended question(yes/no, on a scale of 10). Then we discussed what is qualitative studies( how good it is- mostly open ended questions help) and quantitative studies ( amount - closed need questions help ). Finally about the design studies - observational and experimental. Difference between casecontrol and cohort was explained with an easy example.  Cohort studies filters how many cell phone uesrs have brain tumor and case control studies filters how many brain tumor patients are cell phone users. Overall today's class was very useful about the basic headings how we need to catagorise.
THANK YOU .