Instructional feedback given to the learners during computer simulation sessions may be greatly improved by integrating educational computer simulation programs with hypermedia-based computer-assisted learning (CAL) materials. A prototype of a learning environment of this type called BRINE PURIFICATION was developed for use in corporate training in the chemical and food industry. The simulation part of BRINE PURIFICATION was constructed by means of the design system MacTHESIS, while the CAL part was constructed using HyperCard. BRINE PURIFICATION is designed for the training of process operators. In this paper, the process of specifying, constructing, and testing of BRINE PURIFICATION is described. A report on a comparison of the instructional effectiveness of this integrated environment with a learning environment in which a simulation program is combined with paper instructional materials concludes the report. Two tables present the responses of the subjects on an evaluation form and the distribution of time during the computer session. Three figures provide sample computer screen displays in the simulation program BRINE SimUlaTion and the hypermedium module BRINE tUTor and a flow chart of communication between the two programs. (Contains 21 references.) (ALF)