S. 147 : Reassessment-After the expiry of four years-Survey-No failure to disclose material facts-Information from DDIT-Borrowed satisfaction-Documents of report relied on must be furnished along with recorded reasons-Principle of natural justice-Judgements relied on without bringing notice to the assessee-Reasons cannot be improved or supplemented-Reassessment notice was quashed [S. 133A, 148, Art. 226]