Many parameters can be quantified easily or just by using a specific tool -- for example, length, weight and volume. Other take more effort to quantify -- like quantifying intelligence with an IQ test (itself not a perfect measure) or specific health parameters by taking medical tests. Some even take it as far as to quantify personal qualities, but these tests tend to be greatly flawed and/or biased. One quality which would be useful to quantify, though, is hypocrisy. An adequate measure of hypocrisy would strongly help in finding whether a person is to be as strongly trusted as one thinks.