Identify what changed
The first step is to separate the original scope from the new request or condition. A change order should be clear enough that someone can understand it months later.
Original contract item, drawing reference, or proposal line affected by the change
New work requested, discovered condition, product substitution, or inspection requirement
Photos, field notes, revised sketch, or updated plan view when useful
Whether the change affects layout, structure, materials, labor, schedule, or permit review