S. 147 : Reassessment-After the expiry of four years-Charitable trust-No failure to disclose fully and truly material facts-Where an assessment was framed under section 143(3), a notice for reopening issued after four years is not valid if the reason to believe is based on information disclosed in the return of income, as it does not constitute a failure to disclose material facts. [S. 11, 12AA, 143(3), 148, Art 226]