From the perspective of the Roy Adaptation Model, the human systems are affected by and, in turn, affect the world around and within. This world is called environment. In this study, the ICU environment, nurses, physicians, and family members comprise the patient’s environment during critical illness in which stimuli are received. In the ICU, there is an implicit connection between the physicians, nurses, and family members. The ICU works as a whole because of the interdependence of the physicians, nurses, and family members. The ICU, as a system, is also a constantly changing situation where the patients are admitted and discharged, and where the condition is also constantly changing.