Differentiated instruction is a flexible teaching approach that varies content, process, and product based on student readiness, interests, and learning needs. The teacher plans for and responds to student differences rather than forcing all students into the same mold. Differentiating instruction benefits all students by addressing their varying needs. Teachers can differentiate by content, process, and product to engage students and help them learn in different ways. Assessment is an ongoing process used to identify student strengths and needs, not just evaluate what they studied.