This document discusses research and development (R&D) in education. It defines R&D as research aimed at developing educational products like curriculums and textbooks. The R&D process involves identifying classroom problems, reviewing theories, developing instructional materials based on those theories, validating products with experts, testing products on a small scale, revising based on results, and publishing the final product. Examples of R&D research questions focus on determining what content and activities to include, when to teach materials, appropriate teaching techniques, and assessment methods. In conclusion, R&D is used to produce educational products that can improve instruction and increase student achievement.