The Kenyan government has always aimed at providing quality education and training for all its citizens. This is predominantly dependent on education supervisors and teachers who share the burden in curriculum implementation. Therefore, this study sought to: Establish primary school teachers awareness of the roles of quality assurance and standards officers. This study was conducted in Teso North district, Western province. The study was based on needs assessment theory which postulates that a need should always be linked to the essential knowledge, skills, and attitudes an individual must possess to be competent and therefore accomplish the desired results. The study adopted descriptive survey research design. A total of 180 respondents participated. Thirty (30) head teachers from the selected schools were selected, while the 150 teachers were selected by simple random sampling. Data were collected by use of a self-administered questionnaire for teachers and a structured interview schedule for head teachers. Data were analyzed and presented by use of frequency tables and t-test statistics. It was established that teachers are fairly aware of the supervisory roles of QASOs’ and most teachers generally agree that supervision enhances their professional development. Generally teachers’ are aware of the roles of QASOs’. When teachers are aware of the supervisory roles of QASOs’ they are more likely to co-operate in making the process more successful. The study recommends the introduction of a mandatory course in Quality Assurance and Standards in teacher training institutions.