chness - which of those forms (face-to-face verbal, email, telephone, memos/letters, formal report) would you use in the following situations and why?...

The Continuum of Channel Richness - which of those forms (face-to-face verbal, email, telephone, memos/letters, formal report) would you use in the following situations and why?

1. A Raise

2. Not receiving a promotion

3. An error in a report prepared by a team member reporting to you

4. Additional job responsibilities

5. The upcoming holiday schedule for the new year