Based on your learning this week in Hooley, Butcher, Nock and Mineka (2017), 

2. Review the diagnostic criteria for autism spectrum disorders and discuss the diagnostic criteria and why autism is considered a spectrum disorder.

only reference: Hooley, J.M., Butcher, J.N., Nock, M., & Mineka, S. (2017). Abnormal psychology. (17th edition)