Advocate Arjun Gupta has explained the entire law relating to revision of assessments by the CIT under section 263 of the Income-tax Act, 1961. The ld. author has clearly delineated the extent of the power of the CIT and its limitations. The implications of Explanation 2 to section 263, which was inserted by the Finance Act, 2015, have also been explained in a succinct manner. All the important judgements on the subject have been referred to