Every other day we hear one case or the other being referred to the National Accountability Bureau (NAB). Looking at the exponential growth of corruption in our country, there is a need to set up multiple NAB's. As the Prime Minister has already created four new "useful" Ministries, it will not be out of context to request the creation of multiple NAB's and a separate Ministry under whose umbrella these NAB's will work for effective governance. DR. IRFAN ZAFAR, Islamabad, November 15.