The small pilot project served as a successful proof-of-concept, demonstrating the viability of our design idea.

proof-of-concept 是一个复合名词，由 proof（证明）、of（的）和 concept（概念）组成。proof 表示"证据、验证"，concept 指"概念、想法"。proof-of-concept 的字面意思是"对概念的验证"，在商业和技术领域特指"通过小型实验来验证某个想法或设计是否可行"，即"概念验证"。