Acquiring lawful goods and chattel, so far, has been the basic grievance of Moslem's societies. Homologate the canon of Interest-Free-Banking, has been an active remedy for it.

Specifying the antitypes of unlawful interest is a very difficult problem for Moslems and requires knowing enough about the Islamic contracts.

In this dissertation, all behaviours of people concerning the interest-free- banking are separated and identified all ambiguous frontiers.

This field study has tended to identify: whether the interest-free-banking has been, interest-free in practice.

By using questionnaire, diagnostic interviews with depositors, personnel of banks, borrowers and some jurists in the Iranian banking system, it is concluded that: the interest-free-banking in practice was not interest-free.

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