Other technical considerations that need to be addressed in evaluating portfolios have to do with reliability and validity. Reliability addresses the question “have the evidence appear dependable?”Consistent, stable, and dependable are synonyms for the concept of reliability [Calfee & Masusda,1997] validity, on the other hand, deals with the meaning of students’ scores and whether the scores lead to accurate inferences about students’ strengths also more difficult to measure. One method for assessing validity, is to compare student’s scores on a portfolio assignment with scores on other assessment instrument that measure the same skills [Herman & Winters,1994]