1. [Fingernails for Touchscreens] Since Apple developed its two finger movement to interface with the cell phone software, another phone manufacturer, say Nokia, would not want to use the same finger movements2. Suppose that a Nokia engineer comes up with the idea of using the skin of finger to focus in on a touchscreen while the fingernail is used to focus out. These touchscreens have a metallic sheet to conduct electricity. Touching on this sheet changes the conductivity pattern and these changes are received as commands by the cell phone software. Since skin and fingernail have different conductivity properties, they can presumably create different conductivity patterns on a sensitive touchscreen. Nokia does not produce touchscreens but buy them from Sharp. Sharp has not produced any sensitive touchscreens that can differentiate between a skins touch and a fingernails touch. Nokia will have to develop new touchscreens by integrating Sharp into its product development process which includes four stages: idea generation, feasibility check, design and prototyping. Consider the following three factors: sophistication of the new component, the degree of integration of the new com- ponent with the product, ability and experience of the supplier. Using these factors to decide and explain at what stage of product development Nokia needs to involve Sharp.