It will describe how the technology is going to help maintain or improve health. This proves its effectiveness versus cost of a device. Family Justification Families can also provide documentation to convince the company about the medical need for the device. You can write your own justification letter. It can include information on every day, real-life happenings.
Many vendors have success stories of others who used the same device.
Keep in mind that the information should relate to medical need. For example, a story about how a child uses an augmentative communication device at school, demonstrates an educational rather than medical intervention. Consider videotaping the user trying to perform a medical function with and without the device. It dramatically proves how necessary the device is to the user. You can also send a photograph with the claim.