Question:  "On-the-spot guidance" is a practice which has been made use of by the Chairman of what?
Sentence (from "Kim Jong-un"): Kim Jong-un (Chosŏn'gŭl: 김정은 ; ] or ] ] ; born 8 January 1982–84 or 5 July 1984) is the Chairman of the Workers' Party of Korea (WPK) and supreme leader of North Korea.
Relevant evidence: Yes