In the foregoing we assumed that the contribution of a sentence to the discourse, as represented by a DRS, was obtained in two steps. In the first one, a sentence DRS was constructed in a compositional way; this part of the construction process we took for granted, but its implementation wouldn’t be too difficult. In the second step, the sentence DRS was merged with the DRS representing the prior discourse, and anaphoric references were resolved. This two-stage procedure has become the industrial standard, but the original version of DRT (Kamp 1981, Kamp and Reyle 1993) was monostratal in the sense that one set of rules took care of both tasks at once. In the meantime, Kamp and his co-workers have adopted the two-step method, too (e.g., Kamp et al.  2011).