Activities of daily living (ADL) is a term that was first coined by Sidney Katz in 1950. Essentially, it refers to the basic functions that an individual must perform on a daily basis in order to be considered self-sufficient. By better understanding the level of independence of patients with debilitating illnesses like COPD, osteoporosis, or Alzheimer’s Disease, medical professionals are able to make better decisions for their patient’s well-being such as recommending medical equipment or an assisted living facility. Activities of daily living are generally divided into five distinct categories: