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. Training in human relations, problem-solving, and decision-making skills Positive management attitude toward workers Considering leaders as important assets to the company Higher productivity and morale during the period of experiment Workers feeling that they undertook important and doable projects Opportunities for advancement based on skills acquisition and knowledge Restricted scope and control over workers' job activities