IIBA, BABOK and FEAPO
Not a methodology, as such, but a standard and framework against which Business Analysts measure themselves. The International Institute of Business Analysis (IIBA) is the professional association with the purpose of supporting and promoting the discipline of Business Analysis, or BA. IIBA has created A Guide to the Business Analysis Body of Knowledge (BABOK), a collection of knowledge within the BA profession, reflecting the current generally accepted practices.
IIBA is dedicated to the development and maintenance of standards for the practice of business analysis, and for the certification and recognition of practitioners. Certification includes the Certification of Competency in Business Analysis (CCBA) Designation, and the Certified Business Analysis Professional (CBAP) Designation.
The IIBA is a member of the Federation of Enterprise Architecture Professional Organisations (FEAPO). FEAPO is the worldwide body for professional organisations that have come together to provide a forum to standardise, make more professional, and otherwise advance the discipline of Enterprise Architecture.