ASTM is the world's largest source of voluntary consensus standards. ASTM Committee E-31 on Computerized Systems has developed standard guides for a six-phase method of developing systems. The phases are project definition, functional requirements, functional design, implementation design, system assembly, and system evaluation. These guides have been applied to many different kinds of systems and application areas. An example shows how ASTM standards are applied in a project that integrates process control and management information systems in an aluminum rolling mill.