Identify the factors common to all successful experiments on participative management conducted by a few famous firms in the 1950s and 1960s. (Check all that apply.) Multiple select question. Opportunities for advancement based on skills acquisition and knowledge Considering leaders as important assets to the company Higher productivity and morale during the period of experiment Positive management attitude toward workers Restricted scope and control over workers' job activities Workers feeling that they undertook important and doable projects Training in human relations, problem-solving, and decision-making skills