One important element of a project notebook is sketches. Drawing sketches for your designs allows you to depict complex information. In particular, sketches are useful for portraying three-dimensional objects. Since a sketch is an informal depiction of a concept, it doesn't have to be very precise. Typically, sketches show the basic form of a concept although they can also include more detailed drawings. Sketches become more specific as a project progresses. Many sketches can then be re-drawn for a final report.