S. 147: Reassessment-Change of opinion-Enquiry during original assessment-Where Assessing Officer has raised a specific query during original assessment proceedings to which the assessee has replied, the issue is deemed to have been examined-Reopening assessment on the very same issue, even if not discussed in the assessment order, constitutes an impermissible change of opinion. [S. 37(1), 142(1), 148, Art. 226]