The Soar architecture is not a single system used by a small group of people. Rather it is used by a community of researchers (known loosely as "The Soar Project") who apply it to different problems and domains (e.g., see NL-Soar and Instructo-Soar in this document). The effect of all this use is that the architecture is stretched and pushed, resulting in a better evaluation of its goal to cover the requirements of general intelligence. Thus, the architecture may be used by cognitive psychologists to postulate some mechanisms for observed human data, by computer scientists interested in the computational complexities of production systems, and by engineers who apply the architecture to specific domains and measure its performance. Their results then feed back into the architecture, sometimes reinforcing the motivating hypotheses, sometimes suggesting improvements or pointing out deficiencies in these hypotheses.