Elon Musk reveals his productivity rules in a letter he sent to Tesla employees
Quoting from the article:  Btw, here are a few productivity recommendations:

  – Excessive meetings are the blight of big companies and almost always get worse over
  time. Please get of all large meetings, unless you’re certain they are providing value to
  the whole audience, in which case keep them very short.

  – Also get rid of frequent meetings, unless you are dealing with an extremely urgent
  matter. Meeting frequency should drop rapidly once the urgent matter is resolved.

  – Walk out of a meeting or drop off a call as soon as it is obvious you aren’t adding
  value. It is not rude to leave, it is rude to make someone stay and waste their time.

  – Don’t use acronyms or nonsense words for objects, software or processes at Tesla.
  In general, anything that requires an explanation inhibits communication. We don’t want
  people to have to memorize a glossary just to function at Tesla.

  – Communication should travel via the shortest path necessary to get the job done,
  not through the “chain of command”. Any manager who attempts to enforce chain of command
  communication will soon find themselves working elsewhere.

  – A major source of issues is poor communication between depts. The way to solve this
  is allow free flow of information between all levels. If, in order to get something done
  between depts, an individual contributor has to talk to their manager, who talks to a
  director, who talks to a VP, who talks to another VP, who talks to a director, who talks
  to a manager, who talks to someone doing the actual work, then super dumb things will
  happen. It must be ok for people to talk directly and just make the right thing happen.

  – In general, always pick common sense as your guide. If following a “company rule”
  is obviously ridiculous in a particular situation, such that it would make for a great
  Dilbert cartoon, then the rule should change.