Research approval under section 35(1)(ii) requires annual returns, audited accounts and timely renewal applications. Vikalang Kendra Rural Research Society, Allahabad is approved as an approved institution for research expenditure purposes for 1 April 1988 to 31 March 1989, subject to maintaining a separate research account, furnishing annual research returns by 31 May, submitting audited accounts and balance-sheet by 30 June to the prescribed authority and tax offices, and applying for approval extension before expiry.