Evidence indicates that a common problem for the person with an ostomy is pouch leakage and the development of peristomal skin irritation, which can negatively affect quality of life. While it is clear that the pouching system seal leakage can cause profound problems for the person with an ostomy, little information is available on interventions that focus on leakage. To address this gap, an international group of ostomy nurse experts was convened to develop consensus-based practice guidelines to assist ostomy nurses in determining the best pouching system for the patient. The outcomes of these guidelines for the person with a stoma are to decrease leakage and increase security and confidence leading to an increased quality of life. A large-scale Modified Delphi Consensus-Building Process was used to identify key factors in assessing body and stoma profiles to determine the best pouching system. The resulting consensus provides practice guidelines on how to assess body and stoma profiles, engage and educate patients, and when to follow up with patients after hospital discharge or product change.