N B K - finding out formula of success

Balakrishna- one of the best actors of Tollywood has the habit of accepting film depending on the director and producer. He himself told that in the recent times speaking about Okka magadu.
But now NBK has decided to take some precautions before signing the film. NBK wants to have thorough go through the script before signing and at the same time he has started watching other successful movies to trace the success formula.
Balakrishna who used to watch his own films started watching all the successful films from the Tollywood. He recently watched Happy Days and some other Telugu films to trace out the success formula.