Approval under section 35(1)(iii) imposes obligations: separate research accounts, annual returns, and audited filings required. Approval under clause (iii) of sub section (1) of section 35 read with rule 6 is granted to the Centre for Regional, Ecological and Science Studies in Development, Alternatives, Calcutta, subject to maintaining a separate account for scientific research receipts, furnishing annual research returns by 30th April, submitting audited annual accounts and balance sheet to the prescribed authority and the Commissioner by 30th June, and applying for extension to the Central Board of Direct Taxes at least three months before approval expiry.