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In page Smalltalk:

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Smalltalk was one of many object-oriented programming languages based on Simula.[1] Smalltalk is also one of the most influential programming languages.[citation needed] Virtually all of the object-oriented languages that came after—Flavors,[2] CLOS, Objective-C, Java, Python, Ruby,[3] and many others—were influenced by Smalltalk. Smalltalk was also one of the most popular languages for agile software development methods, rapid application development (RAD) or prototyping, and software design patterns.[4] The highly productive environment provided by Smalltalk platforms made them ideal for rapid, iterative development.