And the validators for that opinion are numerous and come from a variety of political and non-political backgrounds.

WHITEHOUSE: Press Briefing

This year's festival, taking place on a farm near Louth, features appearances from bands including Merlins Keep, The Validators and Voodoo Children.

BBC: EcoFest in Louth

Inexperienced market validators often make a fundamental error in selecting interviewees.

FORBES: Are You Making Something Usable? Part 4 -- But Is It Valuable?