Mary Parker Follett proposed four main principles of coordination: 1) coordination should start early, 2) coordination should be continuous, 3) managers should have direct contact with subordinates, and 4) the decisions of one person/department will affect others so their effects must be considered. Later, four additional principles were added: 5) effective communication is needed, 6) there must be mutual respect, 7) objectives must be clear, and 8) authority and responsibility should be aligned. Follett's principles aim to make coordination effective in organizations.