Newly promoted supervisors face new roles and responsibilities. A primary responsibility is a supervisor's ability to enhance performance among the staff. Delivering effective and productive feedback to their subordinates contributes to human performance improvement which leads to a successful working environment. Organizations have a responsibility to provide their supervisors with the necessary management tools to deliver summative and formative feedback. This evaluative case study examines a program that includes a comprehensive feedback model based on summative and formative feedback that addresses interactions with subordinates in various situations. An evaluative case study is used to evaluate the impact of the CORE Feedback Model and the effectiveness of the supervisors using the model. Questions surrounding the study include the impact, changes and obstacles supervisors experienced when practicing learned feedback techniques. The CORE Feedback Model was used to assist new supervisors with the delivery of performance feedback. Evaluation of the data indicates a practical use of the model.