This document provides a conceptual framework for critical thinking-based implementations by defining key terms and concepts. It summarizes higher-order thinking skills as including creative thinking, critical thinking, reflective thinking, and problem-solving. The document then defines critical thinking and outlines its subcomponents. It identifies significant considerations for designing critical thinking studies, such as teaching critical thinking across disciplines and age groups, ensuring studies are comprehensive and longitudinal, directly targeting an improvement in critical thinking, and providing examples linking critical thinking to daily life. The conceptual framework is intended to clarify definitions and guide the design of scientific studies in this area.