As a rule, global firms and contractors provide clients with engineering design services according to the following expertise: Industrial design; Advanced surface modeling; Prototyping; Reverse engineering; Mechanical/electronic/electrical engineering; Automation engineering; FEA/CFD simulation; Dimensional management; Testing. Engineering design services companies use their expertise in aerospace and defence, automotive, heavy industries, manufacturing, electromechanical and consumer goods, interactive technical documentation, power and energy, and advanced technologies.