"Once you create these tools, it's very tempting to use them, " says Jonathan Zittrain, a Harvard Law professor.

FORBES: Spotting Evil

Once you have a handful of clear, high-leverage strategies, you can use them as a filter to decide what to do.

FORBES

Once you have your list, use the app to tick off things as you pack them, or e-mail the list to other family members.

BBC: Seven trusted family travel apps