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compatibility
In telecommunications and computing, backward compatibility (or backwards compatibility) is a property of an operating system, software, real-world product, or technology that allows for interoperability with an older legacy system, or with input designed for such a system.
Modifying a system in a way that does not allow backward compatibility is sometimes called "breaking" backward compatibility. Such breaking usually incurs various types of costs, such as switching cost.
A complementary concept is forward compatibility; a design that is forward-compatible usually has a roadmap for compatibility with future standards and products.
I found an incomplete ‘77 CJ7 project with a perfect frame and glass tub. I prefer steel so I have a question. Will all year CJ7 tubs fit a ‘77 frame or is there a cutoff year? Thanks.