There is a vital concept in the domain of ITIL. ITIL refers to Information Technology Infrastructure Library. It is a set of many different practices that are used for the management of IT service (ITSM).
This field is focused on the alignment of the IT services based on the specific needs of a particular business. ITIL contains various different processes, tasks, checklists, and procedures which are not specific to any organization but have varying number of applications that depend on the situation.
Key process output variables (sometimes referred to as Key Characteristics) are traits or features of a part, piece of material, assembly, subsystem, or system whose variation has a significant influence on fit, performance, reliability, manufacturability, or assembly.