The application of speed control using adjustable speed drives (ASDs) in industrial applications that contain fans and pumps enables improved energy efficiency and conservation and offers improved process control. However, the success of the application in terms of energy conservation and improved process control depends upon tempering enthusiasm with disciplined logic in order to maximize the benefits. This can only be done by understanding the requirements of the process, understanding the use of the ASD within the process, and understanding the potential for both risk and success for the outcome. Use of speed control does not necessarily equate to energy savings and improved process control. It is only the judicious application of speed control that provides a successful outcome. This paper will consider proven methodologies that may be used in selecting suitable applications for ASDs.