Project-Based Learning (PBL) is an active learning method that puts students in the centre of the learning process, having the teacher perform a facilitating role. This new position of the teacher is not less important because it demands a lot of changes that must be promoted by the teachers, particularly, related to the coordination and organisation of the learning project. An important task in this organisation is the one that has connection with the assessment method and how this should promote students’ behaviour that support their learning motivation. This was the concern in a Business Administration undergraduate program of a private institution in Campos dos Goytacazes city, Brazil. This method required substantial changes in the teaching and learning methods, as well as in the research’s assessment approach. This paper presents an overview of the PBL concepts and the adopted assessment method for this particular course. Furthermore, it discusses the outcomes from the new assessment method. This was an innovative experience that confirmed the positive results from the students' PBL experience and the peer assessment relevance in this learning method.