When a person is looking for a way to communicate in alternative ways, they need to find something that really works for them. They need to try to find a voice that sounds natural. They want to try to find a way to be efficient. They want to be able to communicate as normally as possible, even though they're not using their biological voice.
We all have different towns and we all have different things that we do in the course of the day. It may be that the student is a great artist or a great writer. When it comes to assistive technology we have to think about what is going to give that student the ability to do what they love without having to see roadblocks and go, "I can't do that”. There are so many tools out there, whether it's a communication app, a video app, a math tool. With assistive technology you are not making the student into what you want them to be.
Upper limb therapies and interventions have been well studied in cerebral palsy. Different interventions that have good evidence are Constraint Induced Movement Therapy (CIMT) and Bimanual Therapy. CIMT has been shown to be successful in children with hemiplegic cerebral palsy (CP). CIMT uses a splint to physically constrain the uninvolved arm and encourage them to use the more involved or affected arm.