Ideas vs Concepts vs Constructs: What's the Difference?

Ideas are closer to concepts than constructs because both are abstract mental representations. Concepts are foundational mental categories we use to understand the world, while ideas are creative and novel applications of those concepts. Constructs are more structured frameworks—deliberate models built for specific purposes, like psychological constructs such as intelligence or self-esteem. An idea may arise from a concept (for example, justice inspiring the idea of a fair society), but ideas are more fluid and intuitive compared to the engineered rigidity of constructs.