||Given that the aim with this project was to produce educational resources, we labored to make the language absolutely clear. That proved easier said than done, since animal research ethics is notable for chameleonlike terminology. The word “alternatives,” for example, can mean research models that replace whole animals, “lower” animals that replace “higher” animals, or new ways of doing things in order to inflict less pain and suffering. Therefore, we have included a glossary of terms used in discussions of animal research ethics. And when the writers use ambiguous terms like “alternatives,” they clarify what they mean. In addition to being freely heard, the “nations” grappling with ethical and scientific disputes over animal experimentation must also be clearly understood if they are to progress to a place beyond hostilities and toward constructive solutions.