The document summarizes the author's experience participating in an assessment center as both an assessor and assessee. It describes the activities conducted, which included a role-play and group exercise to evaluate competencies like teamwork and influencing skills. Assessors observed and took notes on candidates' performances. They later met to compare ratings and feedback was provided. The author reflects on lessons learned, such as the importance of preparation and technology like video recording for validity. Room layout and concentrating on multiple competencies at once also impacted the assessment experience.