1. A teaching system for testing and improving behavioral conduct of human subjects who are developmentally disadvantaged, comprising: a plurality of palm-sized, data logging devices, each of said data logging devices being configured to be carried by a respective professional trained to test and teach the human subject and being structured for guiding the professional through a protocol of testing and behavior improving steps and for logging responses emitted from the human subjects, in response to various triggers and stimuli; a computer system operatively coupled with said plurality of palm-sized data logging devices to receive and provide information from and to said plurality of data logging devices, wherein: (a) each of said data logging devices comprise a built-in facility that enables said data logging device to log results related to one or more of an activity, skill, social event, appropriate behavior, or inappropriate behavior of the human subject being tested and treated; (b) each of said data logging devices comprise a facility which enables uploading and/or downloading of data to a central data and control repository of said computer system, which categorizes and maintains results in accordance with various criteria; (c) a processor associated with the computer system which is structured to analyze the data and to develop standardized responses to said results, and to update said standardized responses based on progressive downloading of said data to said central data and control repository; and (d) wherein the logging devices comprise a facility that enables time stamping events within a behavioral stream and recording the number of correct or incorrect behavioral responses and recording response times or reaction times.