According to this model, the problem-specific narrative may evolve in a way that mirrors cognitive development as posited by Piaget (1926): sensorimotor, preoperational
, concrete operations, and formal operations (see Table 1).
The effects of the San Onofre Nuclear Generating Station (SONGS) on the giant kelp Macrocystis pyrifera: final preoperational
Almanacs, said the FBI, can be used by terrorists "to assist with target selection and preoperational
planning." Because almanacs contain information, often accompanied by photographs and maps, about waterways, bridges, dams, reservoirs, tunnels, buildings, and roads, anyone carrying such a thing might be a terrorist or a friend of a terrorist.
According to Piaget, however, children between ages 2 and 7 are in the preoperational
stage of cognitive development, which is characterized by increased symbolic-representational ability (Bornstein & Lamb, 1999).
Piaget believed the process of knowing begins at birth and continues through four stages of intellectual development: sensorimotor, preoperational
, concrete operational, and formal operational.
But a new grassroots advocacy organization is contending that the preoperational
consent forms given to patients in teaching hospitals don't explicitly state that a medical resident or student may conduct a pelvic exam while a patient is unconscious.
The development of symbolic play continues throughout much of what has been termed the early preoperational
period of cognitive development (i.e., 2-4 years of age).
These may be compared with the Piagetian sensorimotor/ preoperational
stages (1953; 1972), or Bruner's enactive phase of learning (1974).
Completion of preoperational
checks, including connection of the stack, takes about 10 minutes.
Piaget's first stage in individual cognitive development occurs between the ages of two and seven for a child and is labeled "preoperational
." At this primitive stage, the one at which "magic" plays a key role in cognitive development, the child has difficulty distinguishing fantasy from reality.
child may perceive God or religion in very simple or even magical terms, whereas the concrete-operational child may have a more logical view of the role of religion.
 When a young child with preoperational
cognitive maturity clearly sees exactly the same amount of water being poured into a thin glass and as that being poured into a wider glass, it is common sense to him that the thin glass has more water in it because the water level is higher.