R and D, analytic, control, control experiment, controlled experiment, cut-and-try, cut and try, empirical, empiricism, examinational, examinatorial, examining, experiment, experimental, experimental design, experimental method, experimental proof, experimentalism, experimentation, explorational, explorative, exploratory, fact-finding, feeling, groping, heuristic, hit-or-miss, hit and miss, indagative, inspectional, inspectorial, investigational, investigative, investigatory, noble experiment, pilot, pragmatism, probationary, probative, probatory, proving, provisional, research and development, rule of thumb, tentative, tentative method, tentativeness, test, trial-and-error, trial, trial and error, trying, verificatory, zetetic