Stage 1 of Piaget's Stages of Cognitive Development is called ❌. This stage lasts from ages ❌. This stage is characterized by the development of ❌ in which the understanding that objects continue to exists even when they are not observed. During this stage, children understand and interact with the world using their ❌. In this stage, children have rudimentary schemas (a schema is mental representation of events and relationships among concepts used to organize the world around you). These schemas tend to become more refined as new experiences occur. Two ways a schema can change is through Assimilation and Accommodation. ❌ modifies an existing schema to fit new experiences to it. ❌ fits new experiences into an existing schema without changing the schema.

Stage 2 of Piaget's Stages of Cognitive Development is called ❌. This stage lasts from ages ❌. This stage is characterized by a child's tendency to be very ❌ (meaning the inability to see a situation from another person's point of view.) This tendency is observable in young children. If Billy takes Sally's favorite toy, then Billy is happy, and he won't understand why Sally is upset, because he is not currently experiencing an upset emotion. Children in this stage also tend to participate in ❌, in which the child roleplays, allowing them to gain a better understanding of the world. As this stage progresses further and further, children will tend to play with added rules and playmates. Another major characteristic of this stage is the inability to ❌, or the inability to determine that a certain quantity of a substance does not change no matter what container it is placed in, or what shape it is in. An example of this would giving two children (Filmore and River) equal amounts of PlayDoh. If River is given her PlayDoh in a ball, and Filmore in a flat sheet, then Filmore will think that River has more, even if he saw the same amount of PlayDoh being flattened moments before.

Stage 3 of Piaget's Stages of Cognitive Development is called ❌. This stage lasts from ages ❌. This stage is characterized by a child's ability to ❌, or the ability to determine that a certain quantity of a substances remains the same no matter the container it is in, or shape it is in. Children in this stage also think a very ❌. Everything is very black and white, with no grey area (i.e. A man stealing a drug in order to save his wife is obviously wrong because stealing is wrong.) Children are also able to do ❌, in which they are able to order subgroups in a hierarchy and relate them to other subgroups. Children can understand that things have multiple dimensions. Children are beginning to understand some abstract ideas (i.e. numbers) but only in very ❌ (i.e. manipulatives, coins, physical objects.)

Stage 4 of Piaget's Stages of Cognitive Development is called ❌. This stage lasts from ages ❌. This stage is characterized by a child's ability to think ❌. Children can do complex mathematics that does not require manipulatives or physical representations of ideas. Children can also create ❌ that they are able to reason through, and think of multiple solutions. Children can also ❌. For example, a child could reason that smoking is bad, even though they never experienced any negative consequences of smoking personally. Some people never reach this stage.