1. Jean Piaget is one of the most famous researchers in value development. How did Piaget formulate that there are four levels of moral development? By researching the discipline patterns of parents. By interviewing grandparents. By interviewing families with children. By observing children at play 2. Bioethics is concerned with ethical implications of biological research methods and results. etiquette in medical research. the ethics of scientists doing research in a university. health care law. 3. Lawrence Kohlberg modified and expanded Piaget's work, laying the groundwork for modern studies on moral development. On which of the following tenets did the two disagree? That the process of moral maturity took longer than 12 years. That children form ways of thinking through their experiences. That children under 12 years of age could understand moral concepts. That children under 12 years of age could develop moral values.