What are some systems or techniques you use to stay organized at work?

If you use specific systems, such as project management software, include examples of how you have found those to be more efficient than other ways you have tried. Conversely, if you rely on written to-do lists, explain how that does not hinder your efficiency.

"I like to keep things simple, by relying on my Outlook to-do list and calendar. In a previous position, we used project management software, but I found that team members often overlooked updating their tasks so it was never completely accurate. I make sure to look at my calendar every morning for what is coming up in the next couple of weeks to ensure those tasks get done."