ASD is often diagnosed in early childhood and in most cases persists throughout the lifespan. The term spectrum refers to the wide range of symptoms skills and levels of impairment that people with ASD can have. Autistic Spectrum Disorders Adapted From 17 Download Scientific Diagram An individual with autism does not always show every symptom. . So ASD ranges from mild moderate to severe. Learn vocabulary terms and more with flashcards games and other study tools. Cost 1 Anat ZaidmanZait 2 Pat Mirenda 3 Eric Duku 4 Lonnie Zwaigenbaum 5 Isabel M. 1 ASD affects each person differently meaning that people with ASD have unique strengths and challenges and different treatment needs. Pervasive developmental disorder PDD Clinically described disorder in which autism is included characterized by severe and pervasive impairment in several areas of development. Reciprocal social interaction skills communication skills or the presenc...