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"need to know"
IT	need-to-know
English thesaurus
need to know [ˌniːdtǝ'nǝʊ]
mil., logist.	Pressing need for an agency, a function or somebody to peruse a piece of information within the framework of a given function and for the proper execution of a specific mission. (FRA)
USA	A criterion used in security procedures that requires the custodians of classified information to establish, prior to disclosure, that the intended recipient must have access to the information to perform his or her official duties (JP 2-01.2)
Need-To-Know [ˈni:dtəˈnəʊ]
IT, abbr.	NTK (DFUE-Slang, Usenet, IRC)

need-to-know : 2 phrases in 1 subject

Information technology

2