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To the surprise of some familiar with the use of classes in OOP, it has been shown that one can design fully fledged object-oriented languages that do not have builtin supports of classes. Those languages are usually designed with the motive to address the problem of tight-coupling between implementations and interfaces due to the use of classes. For example, the Self language was designed to show that the role of a class can be substituted by using an extant object which serves as a prototype to a new object, and the resulting language is as expressive as Smalltalk with more generality in créating objects. See class-based OOP for the criticism of class-based programming and object-based languages for such non-class-based languages.