KSP Rocket Checklist

Before you launch any Kerbal Space Program rocket, look through this entire checklist first:

• MechJeb
• Reaction Wheels
• Delta-V
• Electricity
• Staging
• Action Groups
• Crew

And here's a little mnemonic device if you want:
My Really Derpy Elephant Survives All Crashes

And if you can't remember how to spell mnemonic, here's a mnemonic device for that, too:
Memory Needs Every Method Of Nurturing Its Capacity