Having a dedicated device.

It's important to consider if your young person can understand the difference in using the app or the device to play games etc. If their motivator is games then they will resist using the AAC app.

You can lock the device in guided access but if you have a single device this could be confusing. 

Our solution is a designated  device with a totally different case. I ask my lad to use "his voice" or fetch "his voice". This device is locked in guided access at all times. Having the destination between his iPad to play on & "his voice" has increased its use and decreased frustrations. 

Remember their voice needs to be with them at all times in all situations.