Children's Hospital Boston began a major pain assessment and management initiative 3 years ago: Pain assessment and management are considered one of the institution's primary standards of care. The initiative included State of the Science meetings with internationally renowned nursing pain researchers and clinicians. These meetings generated nursing staff interest in specific applications of what is known about pain; how evidence-based knowledge can be used to ask population-specific clinical questions; and how an evidence-based approach can be applied to systematically develop, implement, and assess interventions that suit a population's clinical needs. This article is an example of an evidence-based pain assessment project at Children's Hospital Boston that focused on nonverbal children with cognitive impairments. After developing a clinical question, the authors did a literature review and a benchmarking analysis of best practice. The pilot of an adapted, existing pain assessment tool is described in this article.