TRIKE - A CONCEPTUAL FRAMEWORK FOR THREAT MODELING

Trike is a unified conceptual framework for security auditing from a
risk management perspective through the generation of threat models
in a reliable, repeatable manner. A security auditing team can use it
to completely and accurately describe the security characteristics of
a system from its highlevel architecture to its low-level
implementation details.

http://www.net-security.org/dl/articles/Trike_v1_Methodology_Document-draft.pdf