"The 5 D's of Getting Things Done" are:

• Discard it
• Digitize it (automate)
• Delegate it
• Defer it
• Do it

Another similar framework from Tim Ferriss is:

• Eliminate
• Automate
• Delegate

Never automate something that can be eliminated, and never delegate something that can be automated or streamlined. Otherwise, you waste someone else's time instead of your own, which now wastes your hard-earned cash.

—Tim Ferriss, The Four Hour Workweek