The purposes of this paper are to (a) propose an operational standard for defining a "practice," (b) encourage development of professional standards for visual and statistical analysis of single-case research, and (c) propose a standard for using single-case research results to identify practices that are "evidence-based." These topics are not new for behavioral researchers, but they become critical for the larger conversations now occurring among researchers, policy makers, and educators working to implement effective practices in psychology and education.