When I talk with companies about IT processes and IT service management (ITSM), ITIL seems to be the de facto standard for ITSM. Implementing an ITSM without using ITIL, seems to be impossible. I have many customers that have implemented ITIL-based ITSM processes and most of them had enormous trouble during the implementation and/ or operation. Lean ITSM and ITIL? Companies mainly have three problems during the implementation and/ or operation of ITIL processes: