Answer: Expertise
Step-by-step explanation:
Expertise is defined as someone who has gained mastery over a craft that he can solve virtually any problem on the craft and won't be tensed with finding answers to problems unlike an intern in the craft would. The expertise would not only know the work but would perform better than most who are not, in many cases the expertise might not spend much time on the work and would perform so well. They could also detect problems by mere observation unlike a novice or a junior in the field. The mechanic has this traits, by his ability to understand the problem of a vehicle by mere observation.