Controversy surrounds the Securities and Exchange Commission's (SEC) Rule 415 that went into effect in March 1982 and remained an experiment until it was permanenty adopted for large firms in November 1983. Rule 415allows a company to register all the securities it plans to issue over the next two years and then to sell someor all of the securities whenever it chooses. This procedure is known as a shelf registration. The purposes of Rule 415 are to simplify the registration of new corporate securities and to allow more flexibility in the way issues are underwritten.