This study examined the use of portfolio assessment to determine the extent to which student teachers are able to demonstrate INTASC principles in their teaching. More specifically, it looked at the role of perception and assumption by identifying inconsistency between university faculty and student teacher expectations and use of the portfolio. The study found that dissonance was prominent in four main areas: purpose, value, perception, and context. Among the factors contributing to the dissonance were lack of clarity of stated purpose for the portfolio, the student teaching environment, and uncertainty between formative and summative nature of the assessment.