When minor changes to existing products are needed, a lightweight team structure is most appropriate. Lightweight teams maintain the functional structure of the organization but add a project manager to coordinate the efforts of various departments. This approach allows for efficient management of minor product modifications without the need for a more disruptive, cross-functional team structure like a tiger or heavyweight team. It provides the necessary flexibility and speed for incremental improvements. References: Clark, K. B., & Wheelwright, S. C. (1992). Managing New Product and Process Development: Text and Cases. Harvard Business Review Press.