This Competency introduces the basic principles governing the structure and the behaviour of solids, liquids, and gases. You will look at the effects forces have on objects and the basic machines that transmit a force. You will also examine the effects of thermal and electrical energy. The following list of lines and competencies was generated with the goal of creating an entry-level trades training resource, while still offering the flexibility for lines to be used as stand-alone books. Line D - Organizational Skills. D-1 Solve Trades Mathematical Problems, D-2 Apply Science Concepts to Trades Applications, D-3 Read Drawings and Specifications, D-4 Use Codes, Regulations, and Standards, D-5 Use Manufacturer and Supplier Documentation, D-6 Plan Projects.