Level 1: Do as I say! This means do exactly as I have asked you to do.
Level 2: Research and Report. This means gather some insight and report to me what you discover before we make a decision.
Level 3: Research and Recommend. This tells us to take the lead on doing the research, think about the answer, and recommend a solution. Provide pros and cons of the decision.
Level 4: Decide and Inform. This level of delegation means that you are taking the lead on all of levels above and apply the solution then inform me as the leader.
Level 5: Act Independently. Take the lead and make the decision. Do not report back, I fully trust you are implementing the best decision possible.