Decision tables provide a graphical representation of complex procedures in a way that is easy to visualize and understand. The work required to define the system, develop and programme the solution and to provide the often neglected documentation can be incorporated in a tabular form so that all elements of decision taking are precisely denned. The tables present the relationships among the interfacing variables dearly and show the necessary sequences of conditions and actions in a simple manner. The writing and development of decision tables for implementation in a manufacturing system is indicated here giving details of appropriate checking procedures and con straint boundaries.