Plans for shelves in my closet
Here is another way I use drawing; to figure out how to build something. Fixed dimension lines are drawn with ball pen; they show the measurements of the actual space available and cannot be changed. The "hard" information I gather (dimensions of what I want to put on these shelves) before making the drawing is also in ink. Then the planning is in pencil, so I can change it as needed. The scale is 1/8" to 1 inch. Now I know the dimensions for additional materials needed, and what the next steps are (1st make uprights and long cleats, 2nd, mark measurements for cleats on wall and on vertical supports). That is enough for now: I might get my carpenter to do the actual building, and this ensures I get what I want.
The rough sketches are just that; notes for construction,which will be done to the scale of the drawing - and the actual space.