What systems development model approach would you use to develop this system?, assignment help

Q1: (2pg)

I’m writing a paper about communication strategies used with children with autism spectrum disorders

I need a research study about picture exchange commuincation system (PECS) to use as a source in my paper

Q2: (1pg)

Based on your reading and study:

What systems development model approach would you use to develop this system?
Why is the system a good match for the systems development model you chose?
What would be the advantage of using your chosen systems development model?
What situations might you encounter that would be a problem for the model you chose?
What would be your second choice of a systems development model for this system and why?