Examples are most effective when they make an abstract idea visible without oversimplifying it, giving readers a pattern they can reuse. In classrooms and technical guides, a strong example usually follows a clear principle, then shows how that principle operates under realistic conditions and defined constraints. A worked example before a can reveal which steps require calculation, interpretation, or careful attention to exceptions, making the underlying method easier to assess. Its value increases when the explanation also identifies why tempting alternatives fail, since readers learn the boundary of the method rather than memorizing a final answer. Comparing two contrasting cases then strengthens transfer, helping learners recognize the same structure in unfamiliar problems, adapt it to new conditions, and apply it with greater independence.