Human and organizational performance, or HOP, is a series of sciences that help us understand how people and systems work together, and how failure can occur in this interaction. This session is designed to introduce the audience to some foundational elements of HOP as applied at Cargill. We will discuss systems thinking, human error and human fallibility, the connection between HOP and Serious Injury and Fatality (SIF) and how we can use these ideas to learn and improve.