We present a cartesian closed category of dl-domains with coherence an
d strongly stable functions which provides a new model of PCF, where t
erms are interpreted by functions and where, at first order, all funct
ions are sequential. We show how this model can be refined in such a w
ay that the theory it induces on the terms of PCF be strictly finer th
an the theory induced by the Scott model of continuous functions. (C)
1994 Academic Press, Inc.