The Assessing Officer has power to reopen the assessment, provided there is "tangible material" to come to the conclusion that there is escapement of income from assessment and the reasons must have a live link with the formation of belief. In the present case, there is no tangible material. The issuance of the impugned notice u/s.148 is nothing but mere change of opinion. In absence of any new tangible material available with the A.O., it is not open to the A.O. to change his opinion by issuing the notice of re-assessment.