This workshop will take you through the main technical components of the Facial Action Coding System, a valid and objective assessment tool for the assessment of facial expressions. We will further look into how and where this method can be applied (i.e., assessment of emotions, deception detection, etc.). The course is intended to give a good overview of FACS and will be a good first step for those interested in exploring this assessment tool as a method of identifying non-verbal expressions. An essential part of the course will consist of hands-on practice, bringing a mirror or reflective surface will be required.