Beginner: Reliant on reference materials; require clear descriptions and general rules for how to manage situations.
Advanced Beginner: Some repertoire of known situations and ability to recognize patterns; able to recall previous instances of similar situations to decide between stocks & flows.
Competent: Able to recognize, prioritize and differentiate patterns or situations; have developed a personal perspective on the modelling process but still require conscious effort to take decisions.
Proficient: Having learnt from a variety of situations, are able to perceive key aspects of a situation; have developed personal principles to determine appropriate action.
Expert: Skills and experience: Proficient with deliberate practice and experience in a number of resolved projects such that they are able to give an immediate intuitive appropriate response.
Master: Skills and extensive experience: Have accumulated a vast amount of experience; are able to articulate their expertise, make it understandable for others in different forms and can teach their knowledge to others.