“The urgency of a problem may be so great that data gathered by the most useful scientific methods might be obsolete before it can be accumulated. If a distraught person is running at us swinging an ax, administering a five-page questionnaire on psychopathy may not be the best strategy.”
About This Quote
There is no such thing as a "Perfect Experiment" rather we can get at interesting data points without the full set of data. pg. 6 - https://books.google.com/books/about/Designing_Social_Inquiry.html?id=A7VFF-JR3b8C&printsec=frontcover&source=kp_read_button&hl=en#v=onepage&q&f=true