Context: They were delightfully surprised. Does your book say anything about improved relationships with coworkers improving productivity? My book says that relationships with coworkers and your work environment are one and the same and thus both influence productivity. Good relations enhance productivity. 
Fact: I am learning from my book that good relationships with coworkers increase productivity.
Category: Routine activities | Time: Present | Referent: Self | Duration: Short-term
Invalid: No | Invalidity reason: None | Followup: None