Writing performance of a complex recommendation report produced by student teams for an actual client during a 15-week semester was compared in a writing-intensive Agronomy 356 course and in paired Agronomy 356/English 309 courses. The longitudinal study investigated differences that existed between reports produced for each learning environment in terms of argument effectiveness, document usability, and professionalism. Three agronomy and three professional communication raters ranked the 12 lengthy reports in the sample. The study found that all top-rated reports were generated in the paired courses and all lowest-rated reports were generated in the stand-alone agronomy course. Four pedagogical factors appear influential in this result: working in dual problem-solving spaces, pushing the boundaries on problem solving, incorporating workplace realities, and using just-in-time teaching. (Contains 6 tables.)