With the trend to incorporate cooperative learning in the classroom practices, another mode of assessing students is required. In other words, how can a teacher enforce Individual Accountability and Positive Interdependence in assessing his or her students? This paper is intended to provide a model of assessing students who are accustomed to having a non-cooperative learning class. It is the intent of the author to share their classroom practice, especially what has done to reduce the lock-step instruction by incorporating cooperative learning thus enforcing the cooperative learning oriented assessment and more specifically imposing the two essential components of cooperative learning.