This chapter introduces the definition, characters of it, compares it with the valid legal acts, the invalid legal acts and the revocable legal acts, and states the meaning of it, based on the conclusions and summaries of the classic books.

• 此章在总结、概括各经典教科书基础上,介绍了效力未定法律行为的概念、性质、特点,并通过效力未定行为与有效法律行为、无效法律行为、可撤销法律行为等的比较,阐述效力未定法律行为的意义。