PECS, picture exchange communication system? are you familiar?

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I have recently purchased board maker which is a software programme, which allows me to access a produce my own picture cue cards at home for my son. I have read most of the pecs users manual and have a few ideas on how to work some cues into our day to day life with a folder (collection of the picture cards)available for him to use. I was just wondering if any other mylotters were familiar with the programmes or have implemented them in their lives. have they worked for you? is your child communicating more now? Can you share some examples of what pecs cards have worked well for you theres so many to choose from its hard to know where to start. I will cover the basics such as letters, numbers, shapes and foods toys etc... i would love some ideas for reward charts or toileting aids.