Lesson on 31st December DFD

Hello all,
we have been learning DFD on 31st December.

here are some material

https://www.dropbox.com/s/tvooalnh5wkmyyw/Session%206_DFD.pptx?dl=0

And we have done exam paper question of March 2017 on 21st Jan class. Hope you all have done it well. :)

cheers !