How many movies have K. Balachander and R. Venkataraman collaborated on?

They have worked on 7 movies together! Their first movie together was Moondru Mudichu (1976) while their highest rated movie together was Varumayin Niram Sivappu (1980). They have not worked together since Zara Si Zindagi (1983). They are most known for their drama films together.