Pitfalls associated with the use of computers in the design of concrete structures are discussed. The concern is with the over-reliance on output and insufficient training on approximate methods for checking and designing. It is proposed that the users need to understand the assumptions made when creating the software, and that engineers need to learn simplified or approximate methods. It is also suggested that a co-ordinated system for software evaluation is required. Specific issues discussed include: reinforced concrete design, sheer strength, column fixity, boundary conditions, torsion, redistribution, and intrinsic movements. 5 refs.