Week 11 · Assignment: Traditional alternative (no AI)

Week 11 — How Long Is a Stage? Reading Piaget's Boundaries Carefully — Traditional alternative (no AI)

Introduction to Psychology Free sample edition

Traditional alternative (no AI), unpublished. In the course this is a separate assignment that ships unpublished beside the adaptive assignment: same objective, no AI. An instructor who prefers it publishes it and unpublishes or deletes the adaptive one, as the note at its top says.

Instructors: publish this instead of the adaptive version if you prefer, and unpublish or delete the adaptive one.

Assignment 10 of the term — use Piaget's boundary ages with careful arithmetic, explain what a stage does and does not tell you about a child, and help a worried parent read a puzzling answer about juice.

This week you learned how development runs from the first year of life to the last: the three big questions, Piaget's four stages and their hallmarks, Vygotsky's zone of proximal development, attachment, Erikson's psychosocial stages, and fluid and crystallized intelligence. In Week 9 you met intelligence and the order in which language develops; this assignment follows how a whole mind develops. You work two short problems, interpret each one, and explain a child's puzzling answer to someone who has never studied psychology. This week's lecture tutorial, quiz, discussion, and Analysis Workshop practise the same ideas from other angles.

The task

Piaget described four stages of thinking that always arrive in the same order: the sensorimotor stage (birth to about 2), the preoperational stage (about 2 to 7), the concrete operational stage (about 7 to 11), and the formal operational stage (about 11 onward). This course uses the boundary ages 2, 7, and 11; other courses sometimes shift an edge by about a year, so every age is an "about."

Work these two problems, showing your arithmetic:

Using the course's boundary ages, the preoperational stage runs from about age 2 to about age 7. About how many years does the preoperational stage last?
A child is 4 years old. Using the course's boundary ages, about how many years remain until the child reaches the concrete operational stage, which begins at about age 7?

Beside each answer, add one brief interpretation and one limit. For problem 1, name the two hallmarks of the preoperational stage (egocentrism and no conservation yet), explain each in your own words, and say why a stage is a kind of thinking rather than a birthday. For problem 2, place the child in a stage, say which new ability the next stage brings (conservation), and explain why the remaining years are an estimate rather than a deadline.

Explain it to a non-expert

A parent who has never studied psychology watched their 4-year-old insist that a tall, thin glass holds more juice than the wide glass it was poured from, and they worry the child "isn't logical yet." Write a 3–5 sentence message that explains, in everyday words, what the child's answer shows, what usually changes later, and one limit of using the stage ages for any one child. Explain any technical term in everyday words, and do not diagnose or label the child.

For a different, ungraded example, imagine a coworker who worries that her 70-year-old father is "losing his edge" because he learns new phone apps slowly, even though he still wins every family trivia night. Model answer: "Psychologists split part of intelligence into two kinds. Fast reasoning about brand-new problems, called fluid intelligence, tends to slow in later adulthood. Knowledge and vocabulary built up over a lifetime, called crystallized intelligence, tends to hold steady, which is why he still wins at trivia. I can't tell you anything about his health from that, though; for that he'd need to talk with his doctor."

Use that pattern for the parent, with your own explanation and evidence.

Show your arithmetic. A reader should be able to reproduce every number you report from the values above without guessing which values or steps you used.

Deliverables

Submit a single brief containing:

the two answers, each with the arithmetic shown and a brief interpretation and one limit;
your message to the parent, explaining in everyday words what the child's answer shows, what usually changes later, and one limit of using stage ages for any one child; and
a one-line restatement of the values you used, so your results are reproducible.

Keep it to roughly one page. Clear and correct beats long.

Choose how you show it. Present your brief as written text, or as a recorded audio or video explanation of about three minutes with a transcript, or as a labelled sketch of Piaget's four stages on an age line with a short note. Every form is graded by the same scoring criteria. Submit in any accessible file type or as a link; a recorded response may be submitted as audio or video with a transcript, or as text.

How you'll be graded

The full analytic rubric is attached to this assignment in Canvas.

Academic integrity and AI use

This version is designed to be completed without AI: do the computations, the interpretations, and the writing yourself, without a chatbot or other AI tool. You may use a calculator or a spreadsheet for the arithmetic. Submitting AI-generated work as your own, or copying another student's numbers, is an integrity violation under the course policy.

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