 It was originally based on the earlier BS 15000 that was developed by BSI Group.ISO/IEC 20000, like its BS 15000 predecessor, was originally developed to reflect best practice guidance contained within the ITIL (Information Technology Infrastructure Library) framework (reference needed), although it equally supports other IT service management frameworks and approaches including Microsoft Operations Framework and components of ISACA's COBIT framework.The differentiation between ISO/IEC 20000 and BS 15000 has been addressed by Jenny Dugmore.