Scanning using one or two switches allows people with severe physical impairments to use a computer or augmentative communication device. Unfortunately, switch use can be challenging, and switch scanning is an inherently slow method of communication. This two-part series describes the tools and principles to: 1) identify challenges a user may be facing with their switch or scanning system, and 2) recommend and implement adjustments to enhance the user’s performance. Part 2 focuses on using data to make targeted adjustments to a user’s switch or scanning setup, and presents multiple case examples. This process typically yields significant improvements to text entry rate and user satisfaction.