Basic Concepts of Chemistry was originally written over thirty years ago to address the needs of general chemistry students with little or no background in chemistry. Over time, the text has evolved beyond purposes solely aimed at a preparatory chemistry course. For some preparatory chemistry students, a main sequence in general chemistry may follow, but for others, a semester of organic and biochemistry may follow. Other students enroll to simply satisfy a basic science or chemistry requirement. The text was written with a level and functionality designed to accommodate the needs of each of these varied groups of students. Basic Concepts of Chemistry was designed with a flexibility that allows instructors to emphasize or omit certain clearly delineated sections. The mission of the text has evolved in response to the increased diversity of students and the emphasis on outcomes assessment.