Want to be confirm about Responsive design

Hey everyone,
I'm going design a responsive web application. The app will for web, mobile, and tab (Responsive).
I'm confused about the PSD. Am I need do design the PSD for each version? I meant 1 psd for web, 1 psd for mobile, 1 psd for tab.
So far I know, I don't need to create 3 PSD. The programmer will able to work with only a PSD. But I want to be clear about the confusion.
Can anyone explain all things?
Thanks
Rikon

Depends on your design. If your design is too complex, then create three PSDs like you mentioned and make separate HTML ( remember to keep the ids and classes the same) and then use @media queries for fusing them together..

If the coder and designer are diff people then it's better to have a diff layout for each template. To avoid confusion and corrections. It's a lot a work but it's worth it at the same time. Specially if everything is correct and perfect the first time it's coded (as far as design is concerned)

Unless anything drastically changes within the layout (say the nav bar changes color and placement) then I would design a psd for all devices.