blueprint

Concise Oxford English Dictionary © 2008 Oxford University Press:
blueprint/ˈbluːprɪnt/

▶noun

• 1 a design plan or other technical drawing.

• 2 something which acts as a plan, model, or template.

▶verb N. Amer. draw up (a plan or model).

– origin C19: from the original process in which prints were composed of white lines on a blue ground or of blue lines on a white ground.