Here are some tips:
- Start by making sure each task has a deadline. If you are given one by someone else, then use that. If not, then set a deadline, one that is realistic, and work within that boundary.
- Now, look at all the factors that make up importance. Some of the most common are: who asked, who is affected, the impact of the project, cost, safety, how many are impacted, relevance to mission, and so on, based on your job and your company's mission.
- Using these qualifiers, give the task/project a rank, on a 1 - 10 scale.
- Now, by using the deadline and the importance ranking, you can make an educated decision on what comes first.