This project’s implementation showed how Hildegard Peplau’s Interpersonal Relations Theory could be used to implement a quality improvement project. 1-Add how nurse patient relationship influenced the implementation of PHQ-9 for depression screening in primary care based on this theory. 2-Add how patients increased health related quality of life (QOL). How Peplaus’ theory contributed to this? 3-Mention at least 2 studies that used Peplaus’ theory to provide insight into depression symptoms and diagnosis.