Designing data collection tools

[@geetharani4667]

Extra ordinary performance by one of the legend from National Institute of Epidemiology,Scientist DR Tarun Bhatnagar,
Thank you sir,..,

[@geetharani4667]

Dear sir,
very impressive and valuable class by you sir,

[@blackpeterpan]

Informative

[@parbatimondal5409]

Thank u sir

[@saeedtheman]

what tool are you used to collect data