Agile modeling (AM) is a methodology for modeling and documenting software systems based on best practices. It is a collection of values and principles, that can be applied on an (agile) software development project. This methodology is more flexible than traditional modeling methods, making it a better fit in a fast changing environment. It is part of the agile software development tool kit.
Agile modeling is a supplement to other agile development methodologies such as Scrum, extreme programming (XP), and Rational Unified Process (RUP). It is explicitly included as part of the disciplined agile delivery (DAD) framework. As per 2011 stats, agile modeling accounted for 1% of all agile software development.
There are several best practices:
The development of agile modeling was led by Scott Ambler starting in the autumn of 2000. It initially was called extreme modeling (XM) but at the suggestion of Robert Cecil Martin was renamed to AM in the spring of 2001. The book Agile Modeling  was published in 2002 by John Wiley Press. He also has a promotional web site.
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