Core-Plus Mathematics is a field-tested and evaluated college-preparatory high school mathematics program. The curriculum materials emphasize the integrated development of fundamental concepts and skills in algebra and functions, geometry and trigonometry, statistics and probability, and discrete mathematics. Included are student-centered investigations of important mathematics, in the context of realistic problems and applications, leading to a robust understanding of mathematical concepts, principles, and techniques and productive habits of mind. Supported during its development by the National Science Foundation, one link is to the publisher's website and another is to the Core-Plus Mathematics Project development site.