When developing an inputs document for a new product it may be a challenge to obtain or come up with the inputs and specifications. As mentioned in the lecture, R&D engineers may help support this by performing development tests or engineering studies. By experimenting, an engineer can come up with specs for mechanical inputs, such as torque, force until failure – by testing similar products, simulating the device function, or researching data from ASTMs and scientific articles. When an engineer can develop a possible range of values for an input, they can now devise a spec that the device must either pass or not pass.