Blueprints Drawings 60 Building 36 Details 36 Welding 19 Machinery 17 House construction 15 Mechanical drawing 13 Freehand technical sketching 9 Engineering drawings 8 Air conditioning 5 Computer-aided design 5 Equipment and supplies 5 Heating 5 Ventilation 5 Interactive multimedia 4 Planning 4 Architecture 3 Buildings 3 Charts, diagrams, etc 3 Designs and plans 3 Electric wiring 3 Machine-shop practice 3 Creative ability 2 Dimensioning 2 Drawing 2 Lists 2 Orthographic projection 2 Plumbing drafting 2 Structural drawings 2