Group work involves a myriad of complex processes encompassing social, perceptual, cognitive, and contextual factors. However, there is a lack of empirical research on computer-supported group work processes and their impact on outcomes at different stages of group work, especially when creativity and quality of outcomes are significant. Group work processes can interfere and hinder productivity, which we refer to as the "group folding effect. " We designed a three-stage process structuring to enhance group work productivity. In a field study, we examined how process structuring shapes productivity in two sub-studies: design and peer feedback, each with 40 participants (N = 40). The results revealed that process structuring significantly improved both the quantity and quality of productivity. Additionally, process structuring appeared to reduce inhibitory effects of group work, such as negative priming, fixation on familiar ideas, and social comparison. We discuss the implications of this research in supporting productive group work processes in collaborative tools and insights into a pattern of the group folding effect.