This document discusses various ethical systems and approaches to determining moral behavior. It begins by providing two examples of ethical dilemmas, including one about an employee who publicly quit Goldman Sachs and another about a detective who uncovered police misconduct. It then outlines several ethical systems such as deontological ethics, which focuses on inherent morality of acts, and teleological ethics, which focuses on consequences. It also discusses ethical formalism based on Kant's categorical imperative, utilitarianism, which focuses on the greatest good for the greatest number, and virtue ethics. The document notes criticisms of each approach and concludes by discussing other decision-making principles and relativism versus absolutism.