Architects experience difficulty in predicting people's reactions to buildings. To achieve a systematic and objective evaluation of laymen's emotional responses to the built-environment, we are compelled to refer to experimentation based on scientific procedures and research designed accordingly. While the experimental method is best to accomplish scientific acceptability, the quasi-experimental method appears to be an optimal approach for Architects, for the complexity of the architectural environment do not allow strict control and manipulation of the variables. Within this context, the confounding factors, experimental population, data-collection and test instrument become of central importance as well as the presentation of the stimuli and the nature and format of responses, and they all affect the validity, reliability and precision of the results. Finally, the convenience of administration of the experimentation is an imperative to meet if Architects are expected to sympathize with scientific research.