Problem: Most often media plans are written annually so that everyone involved is informed and results can be measured against objectives. Yet due to changes in the marketing environment a media planner may need to make adjustment to the media plan. Identify some of these types of situations. Multiple select question. the media plan blocking chart may indicate gaps in media coverage the availability of a medium may change a competitor may invest a lot in certain media new audience data in a media vehicle an opportunity to advertise in a new media vehicle