This paper focuses on the results of a study conducted to explore the effects of collaborative assessment. Forty college students studying at the English Language Teaching Department participated in the study. During the study the participants were briefed about the principles and practices of collaborative and self-assessment and were given the criteria developed in line with the course requirements. They were also informed that at the end of the course they would have the opportunity to evaluate their performance with their instructor. All participants were allocated 15 minutes to justify their mark by referring to their language learning experience in class, discuss it with their instructors and finally agree on a joint mark with their instructors. After the evaluation, the participants were interviewed and were asked four questions about the process of collaborative assessment. The answers and the comments of the participants about the process constituted the main part of this qualitative research. The analysis of the results suggests that the research participants find the entire process very successful and functional.