2.3 Piagets Stage of Development 2.2.4 Forml operational stageleleven to adulthood) One deals abstractly with hypothetical situations and reason o The major accomplishment is abstract and pure symbolic thin king possible. Problems can be solved through the use of systematic experimentation2.3 Piaget’s Stage of Development ⚫ 2.2.4 Forml operational stage(eleven to adulthood): ⚫ One deals abstractly with hypothetical situations and reason. ⚫ The major accomplishment is abstract and pure symbolic thinking possible. Problems can be solved through the use of systematic experimentation