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know-how
This term describes a specific type of expertise that is gained through experience rather than theoretical study. It emphasizes the ability to execute a task effectively, often encompassing "tricks of the trade" or intuitive mastery that cannot be easily codified in a manual.
Grammatically, know-how is an uncountable noun. It cannot be pluralized and does not take an indefinite article (e.g., one does not say "a know-how"). To quantify this noun, partitive constructions such as "a great deal of know-how" or "some technical know-how" must be used.