You can understand, design and diagnose faults in mechanical systems of all kinds. You may not actually be able to build and fix them - such activities fall under the purview of the Mechanics knowledge - but you can design a set of plans from which a skilled mechanic can build almost anything from a toaster to an air-plane.

• Novice: Amateur.

•• Practiced: Student.

••• Competent: Junior engineer.

•••• Expert: Chief engineer.

••••• Master: Ace inventor.

Specialties: Automotive, Air, Marine, Domestic, Maintenance Repair, Invention.

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