This empirically based study sought to discover factors underlying diverse sources of information used to inform therapy practice, perceived salience of sources of evidence for clinical practice, importance of common factors to therapy efficiency, and beliefs about evidence-based practice, particularly in the form of evidence-supported treatments (ESTs). The investigation also sought to uncover possible relationships between a variety of individually based demographics and institutionally based demographics and their possible relationship to factors underlying these diverse sources of information. A number of interesting findings emerged. (Contains 6 tables.)