The National Transportation Safety Board has issued a set of recommendations to the FAA intended to increase scrutiny on flight-instructor performance. Using the 2019 crash of a parachute-jump Beech King Air in Hawaii as the impetus, the NTSB's latest recommendations ask the FAA to more closely watch pass/fail rates of students from any given instructor to help detect sub-par training. The June 2019 accident resulted in 11 deaths, including the pilot, after the Oahu Parachute Center King Air impacted terrain shortly after takeoff.
This is a companion discussion topic for the original entry at https://www.avweb.com/aviation-news/ntsb-to-faa-watch-those-cfis