If you had an account on the Volume 4 website for the HCM 2010 prior to August 2016, you don’t need to sign up again. Instead, log in on this site using the same username and password you used before.
Registration is FREE! Registering will enable you to view all of Volume 4, which includes a Methodological Details section with supplemental chapters 25-37, Interpretations and Errata, Applications Guides that provide examples of real world implementations of the HCM, a Technical Reference Library that provides electronic copies of many documents referenced within the manual, and a Discussion Forum where HCM users can pose questions to other users about the HCM.