bea15239_king_Group___MedBiquitous_Wiki__CWG_definition
[Term] Performance level Pediatrics: Developmental milestone -"behavioral descriptions of the developmental progression of the knowledge, skills, and attitudes that define each of the sub-competencies within the broader competency domain...since milestones map directly to the sub-competencies, they help to pinpoint at what level in the developmental progression a resident is performing and to address any specific subcompetencies that may be barriers to entrustment. Specific milestones must be reached for entrustment to occur."(6) Internal Medicine reporting milestone Emergency medicine: Milestone public health: similar to the Tiers used for the Core Competencies. [AAMC] Use MedBiq [CWG definition] 
Adapted from AAMC draft: A specific level within a level schema (e.g. novice to master) defined by one or more measurable behaviors (performance criteria) related to a specific competency. Levels are ordinal data; that is, there is an order to the performance levels of a competency.
Performance Framework - Definitions - Competencies Working Group - MedBiquitous Wiki
CWG definition