Measures of survey reliability are commonly addressed in marketing courses. One statistic of reliability is "Cronbach's alpha." This paper presents an application of survey reliability as a reflexive application of multiple-choice exam validation. The application provides an interactive decision support system that incorporates survey item accuracy and item discrimination. The application both illustrates a theory of survey reliability and simultaneously can be used to practically improve marketing teaching. The application is implemented in Excel without macros and is freely available for download. (Contains 3 figures.)