S. 153C : Assessment-Income of any other person-Search-Opportunity of cross-examination-Assessment founded on diaries and statement under section 132(4) of a third party-Cross-examination denied by the Assessing Officer and the Tribunal-Violation of natural justice-Matters remanded for fresh adjudication after allowing cross-examination. [S. 132(4), 143(3), 153A, 260A]