Final answer:
The formal operational stage is the stage in Piaget's developmental theory where development proceeds from logical, concrete thought to logical solutions to all kinds of categories of problems. This stage occurs from about age 11 to adulthood.
Step-by-step explanation:
The stage in Piaget's developmental theory where development proceeds from logical, concrete thought to logical solutions to all kinds of categories of problems is the formal operational stage. This stage occurs from about age 11 to adulthood. In the formal operational stage, children can think abstractly, use hypothetical situations to problem solve, and consider alternative solutions. They can also test these solutions to determine their effectiveness.