Plant Computer Control Systems and Supervisory Control and Data Acquisition (SCADA) Systems specified for water treatment applications require plant operator, management, and maintenance personnel interfaces with the computer system. Amazing effects and wondrous displays are possible with the software available today, but applying these features for consistent user interface poses many challenges, particularly with large systems. A well configured plant control system is equally important as the hardware design. This paper describes and compares the approaches and results of configuration organization procedures on plant process control systems and SCADA system configurations. The term configuration refers to the programming of an entire control system. This includes programming a vendor's standard software product for the supervisory control processor and field interface processors that together comprise the computer control system. Plant process control systems and SCADA systems both use a general configuration procedure that is the basis of a solid approach to providing a custom configuration.