Kohlberg's theory of moral development posits that the post-conventional level is the highest stage. At this level, individuals move beyond simple adherence to social rules or laws. Instead, they evaluate moral dilemmas based on abstract ethical principles, human rights, and the universal value of justice, even if these conflict with established societal laws.

Piaget proposed that cognitive development begins with 'action schemes,' which are organized patterns of behavior or mental structures that infants use to interact with and interpret their environment. These early sensory-motor actions serve as the building blocks for all future cognitive development, eventually evolving into more complex, abstract mental operations as the child matures and encounters new experiences.

In Piaget's theory, children in the pre-operational stage (ages 2-7) often fail conservation tasks because they exhibit centration. This means they focus on only one salient dimension of an object, such as the height of the liquid in a beaker, while ignoring other relevant dimensions like width, leading to incorrect conclusions about quantity.

Theory of mind refers to the cognitive ability to understand that other people have beliefs, desires, and intentions that are different from one's own. By age five, children typically develop this capacity, allowing them to recognize that someone else might hold a 'false belief' about a situation, which is a hallmark of social-cognitive development.

Kohlberg's theory of moral development is based on the premise that moral reasoning is a byproduct of cognitive development. As children mature and their ability to think abstractly and logically increases, their capacity for moral judgment evolves through distinct stages, moving from self-interest to social conventions and finally to universal ethical principles.

Jean Piaget is a foundational figure in developmental and cognitive psychology. He developed a comprehensive theory of cognitive development, which describes how children progress through distinct stages of intellectual growth. His work focuses on how children construct mental models of the world, emphasizing that intellectual development is a qualitative process that changes as the child matures.

The concrete-operational stage, occurring roughly between ages 7 and 11, is marked by the development of logical thought regarding concrete events. A key milestone in this stage is the acquisition of 'conservation'—the understanding that physical properties of objects, such as mass, volume, and number, remain constant despite changes in their outward appearance or arrangement.

During the concrete operational stage, children develop the ability to understand conservation, which is the realization that the quantity of a substance remains constant even if its physical appearance or container changes. This marks a significant shift from the preoperational stage, where children are often misled by visual changes. Mastering conservation allows children to perform logical operations on concrete, physical objects.

A five-year-old's moral development is constrained by several factors. Cognitive immaturity limits their ability to process abstract ethical principles. The belief in immanent justice leads them to assume that punishment is an automatic consequence of wrongdoing. Furthermore, viewing moral rules as absolute and unchangeable prevents them from understanding the nuance or context required for more advanced moral reasoning, making all listed factors significant contributors to their current stage of development.

Lawrence Kohlberg proposed a theory of moral development consisting of three primary levels: the preconventional level, the conventional level, and the postconventional level. Each level contains two stages, representing a progression in how individuals reason about moral dilemmas, moving from self-interest and social conformity to abstract ethical principles and universal human rights.