Re-use Previous Plans

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As a teacher, one of the great advantages of teaching the same class two years in a row is the fact that you get to re-use your old lesson plans. Sure, you have to tweak them a bit, keep it fresh and up to date, but you can stick to the same essentials.
The amount of time you can save is huge! Planning classes last year took me on average about one hour for a 90 minute class, which I could then teach 7 times (luckily). Now, it's a matter of pulling up the old plans and bringing them to class. I still remember how to teach them.

But not only teachers can benefit from re-using old plans.

Think of plans you've made in your daily life. Examples that quickly come to mind are meal plans or travel plans. You've likely made a list at some point of things you need to bring, things to remember, etc.
Instead of throwing out those lists when you're done with them, file them somewhere you can find them easily. Next time a similar situation comes up, there's no need for you to start from scratch again. Just use the old plan, or use it as a basis for your new plan.

I'm sure the annual meeting covers similar topics every year. I'm sure your kids need the same stuff for their first day of school, and that the contents of your overnight bag haven't changed much. Keeping your plans can be a great way to reduce stress and save time.

What kind of plans do you re-use? How about party plans? Have you thrown a similar party twice?
You could share plans with friends too!