Quantification of complexity in complex systems continues to be elusive. This note attempts to explain why. I give a review of various attempts to formulate complexity metrics and their relative ease of construction and utility values. I present a number of worked examples as well as pointers into the complex systems and information theory literature. I also give some discussion on what (I think) complexity might really mean and how it can help us characterise and categorise systems at some level.
Keywords:complexity; complexity measures; complex systems.
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