answer:Trust is a complicated thing, as everyone will tell you. For me, the way I trust someone is based on different levels. As you said, you would trust your key to a valet but not to a random stranger. That requires a type of trust that is instant and consequence free at the time. The decision weather you want to park your car yourself and take extra time or let someone completely strange to you working for that fancy restaurant you are paying hundreds to eat it at do it himself is left entirely to you. Other types of trust are more emotional and deep. The trust you have with your Mother or Father, the trust you have with your sister or with your best friend; they are all different types of trust that require more time and not just a spontanous decision. The way I do it is by basing the time I’ve known them and adding the nice things they’ve done for me. Obviously judging a person is required, which may seem bad at times, but completely necessary in our survival mechanism. My criteria is that if they have been honest to me, and I know for sure, then I know I can start being honest back to them. A bond is formed upon that and is woven to what you call interpersonal-trust.