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However, more often, objects represent abstract entities, like an open file or a unit converter. Not everyone agrees that OOP makes it easy to copy the real world exactly or that doing so is even necessary. Bob Martin suggests that because classes are software, their relationships don't match the real-world relationships they represent.cite-ref-6[6] Bertrand Meyer argues that a program is not a model of the world but a model of some part of the world; "Reality is a cousin twice removed".cite-ref-footnotemeyer1997230-7-0[7] Steve Yegge noted that natural languages lack the OOP approach of naming a thing (object) before an action (method), as opposed to functional programming which does the reverse.cite-ref-executionikon-8-0[8] This can make an OOP solution more complex than one written via procedural programming.cite-ref-executionikon2-9-0[9]

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