What are the elements of a 'panel' game show?

What are the elements of a 'panel' game show?

Bob Boden (Vice President of Production, Fox Reality Channel) gives expert video advice on: What are the elements of a 'question and answer' game show?; What are the elements of a 'relationship' game show?; What are the elements of a 'puzzle' game show? and more...

One genre of game shows that hasn't had great popularity of recent but was huge when game shows first proliferated on television was the panel show, including What's My Line, I've Got a Secret, To Tell the Truth and games of that nature, mostly produced by the Mark Goodson