An antipattern is a frequently used, but largely ineffective solution to a problem. The term was originally used to refer to a pattern gone wrong. Just as a viable pattern describes the way from a problem to a valid solution, an antipattern describes the way from a problem to a poor solution. Furthermore, by adding more difficulties to the ones that originally existed, an antipattern may leave you in a worse position than before you started. Several writers have published books or papers on how to recognize and avoid adopting an antipattern, especially in developing computer programming.
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The term amelioration pattern (to ameliorate means to improve, and especially to improve a bad situation) was coined for a pattern that describes how to go from a bad solution to a better one.