Whole Sort Of Genl Mish Mash
Rather than try to summarize many of the different views, I'll drop a few names and you can dig in for your self. In the study of human behavior, I recommend B. F. Skinner (the founder of Behaviorism). Piaget was the founder of a different Cognitive Development school of thought.
Much information can be found by looking into disorders that involve social interaction (autism, PDD, Asperger's Syndrome). Dr. Ivar Lovaas pioneered a branch of Behaviorism called Applied Behavioral Analysis that has made landmark strides in the understanding and treatment of autism spectrum disorders (autism involves a deficiency in appropriate social behavior including speech and social engagement).
I am afraid my experience and knowledge is limited to the Cognitive and Behavioral models and, therefore, I do not think I can offer you much more. I am a witness, however, to the effectiveness of Applied Behavioral Analysis in the treatment of autism and am an advocate for the approach (because it works). I do think a good and interesting place for you to begin is by studying effective treatments of social disorders. Good luck.