The global regulatory pressure to create new standardized documentation for the complicated and arcane process of posting variation margin has been extraordinary. In response, ISDA issued two standard forms of Credit Support Annexes for Variation Margin. Thankfully for neophytes and experts alike, Paul Harding and Abigail Harding have provided a rosetta stone for understanding these new forms and the regulations and regulatory environment surrounding them. This new practice guide provides an articulate, cogent and comprehensive discussion of these issues and the regulations driving their creation, complete with a thorough annotation of each of the provisions in the two 2016 Credit Support Annexes. No derivative documentation specialist or practitioner’s bookshelf will be complete without it.