When dry-fitting boards to be glued up later, here's a trick to help you make sure you will be able to get them back together in the right order. After the boards are in the desired position, draw a triangle large enough to cover all the boards of the section. Later, before clamping, just re-create the triangle as you assemble the boards.
Even on rough carpentry projects, such as laying out a wall or partition with a carpenter’s square, sharpen your pencil after every six marks. Using a blunt pencil could add as much as an inch to the overall dimensions over about 20 feet. This can throw the entire structure out of whack and make it difficult to fit wallboard, sheathing and other modular materials.