Screen Time: The Power is Yours

The Power Is Yours: Simple rules for supervising screen time, Scouting Magazine, March April 2018.

Simple rules:
Enjoy Screens:  Screens are not all bad.  They can bring games, and social interaction with family that is far away. 
Not Too Much:  Screen time can be limited by requiring credits for screen time.  Credits can be earned via chores.  Using screens before bed disrupts sleeps.  Good reason to turn them off an hour before bed and keep them out of the bedroom.
Mostly with Others:   Keeping screens out of the bedroom is big here.  Also doing activities together, such as family history, or research projects, or Instagram projects.
Lead by Example: You can lead by example by letting kids know what you are doing when you look at a screen during family time.  If you are overusing, then your kids will too.
Lastly, some age appropriate ideas:
No screen time under 18 months except for video chatting
18-24 months only age appropriate programs such as PBS which you watch with them and explain.
2 to 5 years: Limit screen time to less than an hour per day.  Watch with them so you can pause the programs and talk about things.
6 and older: Place limits and stick to your limits.  Agree on media-free times.