This paper has five purposes: (1) To report on the technicalities of the RWC emission issue. (2) To enumerate the various factors which must be considered in an RWC emission regulation. (3) To report on the use of regulatory negotiation, and how this differs form normal EPA rulemaking procedures. (4) To show how negotiation is particularly applicable to an RWC regulation. (5) To examine the thesis that a negotiated regulation was an appropriate alternative by reporting on how various specific issues were resolved in the six regulatory negotiation (reg-neg) committee meetings held monthly from March to August 1986.