What do you intend to achieve? This is the most question people fail to ask themselves before starting the project. You should have the results at the back of your mind before you start putting anything down on the spec sheet not input just a bunch of stuff in the Sheet Templates really. I promise you they will be just normal useless pieces of paper if you do not know what your data is. Whether you are doing a system or describing a product, knowing what data to use will help you end up with the correct specs details for your project.