Stage of change algorithm for nutrition counseling guide
Build a five-question Stage of Change algorithm for one specific dietary behavior, administer it to two people, and submit the algorithm with a short summary naming the transtheoretical stage you identified for each person.
Editorial process
Last reviewed · August 12, 2026
What makes a set of questions an algorithm?
The submission has two halves and they are graded on different things, so treat them as two pieces of work. The algorithm is a short branching set of questions whose answers route one person to exactly one transtheoretical stage, which means it has to be built around the two variables the model actually uses: whether the behavior is happening now, and how soon the person intends to start it. The Ch 4 lecture example under Modules exists to show that shape, and the five-question structure you were told to follow is a constraint rather than a suggestion. Choose one narrow dietary behavior before you write a single question — five vegetable servings a day, cutting sugar-sweetened beverages, eating breakfast — because an algorithm aimed at eating more healthily cannot produce a clean stage assignment, and every routing question after it becomes ambiguous for the person answering.
Most of the marks turn on getting the stage boundaries right, and three of them are routinely blurred. Precontemplation and contemplation are separated by intention within roughly six months, not by knowledge or concern, so someone who knows the behavior matters but has no plan to start is still in precontemplation. Contemplation and preparation are separated by a concrete near-term commitment, usually within thirty days, and often by some step already taken. Action and maintenance are separated by duration, conventionally six months of the new behavior, not by how confident the person feels about it. Write your questions so each one tests a single boundary and yields a yes or no, then draw the routing explicitly, because an algorithm whose questions overlap will assign two stages to the same answers and cannot be scored. Trace a few imagined respondents through your own routing before you use it on anyone, since a dead end or a double assignment is far easier to fix on paper than mid-conversation.
The summary is short but it has a required content list, so cover it deliberately. Name the stage you identified for each of the two people and say which specific answers produced that assignment, since the assignment asks for the stage and the marker cannot check your routing without seeing the path. Then describe the experience of administering it: where the wording was ambiguous, where someone answered around the question rather than to it, and whether either person's self-report seemed to sit at odds with what they described doing. Those observations are the real content of a reflection on a screening tool, and they matter clinically because the stage you assign determines the counseling approach, so a tool that misroutes people sends a counselor to the wrong intervention entirely. Keep the two write-ups distinct rather than merging them into one account, because the assignment asks for the stage of each person separately and a blended summary hides which answers belonged to whom.
Likely learning objectives
Inferred from the brief — check these against your own rubric.
- 01Choose one specific, measurable dietary behavior before drafting any question.
- 02Build five questions that each test a single stage boundary and yield a routable answer.
- 03Separate precontemplation from contemplation by intention within six months, not by awareness.
- 04Separate action from maintenance by six months of sustained behavior, not by confidence.
- 05Report the stage assigned to each of the two people and the answers that produced it.
Read the full question
Review every instruction before using the planning guidance that follows.
Turn the brief into deliverables
- 01The Stage of Change algorithm itself, structured as five questions with explicit routing.
- 02A brief summary of the experience of administering it to two people.
- 03The stage of change identified for each of the two people.
Where do the stage boundaries actually fall?
The behavior, defined
Name one narrow, observable dietary behavior with a frequency or quantity attached, so every later question can be answered yes or no about it.
The five questions and their routing
Write one question per boundary: doing it now, doing it six months or more, intending within thirty days, intending within six months; then map each answer path to one stage.
Administering it to two people
Record each person's answers, the path they took, and the stage that resulted, noting any question they had to have explained.
The summary
Report the two stage assignments, the ambiguity you met in the wording, and why misrouting matters for the counseling approach that follows.
Where is the transtheoretical model documented?
Recommended databases
- NCBI Bookshelf / StatPearls
- NIDDK
- MedlinePlus
Search sequence
- 1.Read the stages-of-change definitions and confirm the six-month and thirty-day boundaries before drafting questions.
- 2.Review the Ch 4 lecture example under Modules for the required five-question shape.
- 3.Check a behavior-change source for how stage assignment drives the counseling approach.
- 4.Draft the algorithm, administer it to two people, then write the summary from what actually happened.
Reference shortlist
These are authoritative starting points, not a ready-made bibliography. A qualified reviewer must confirm that each source fits the assignment and supports the claim beside which it is cited.
Nothing here is cleared for citation until you have read it.
- 01
Stages of Change Theory
StatPearls, NCBI Bookshelf · 2023
The definitions and boundaries of the five transtheoretical stages that the algorithm has to route people into.
- 02
Changing Your Habits for Better Health
National Institute of Diabetes and Digestive and Kidney Diseases · 2024
The stage-matched approach to dietary change, showing why the stage you assign determines the counseling you would offer.
- 03
Nutrition
MedlinePlus, U.S. National Library of Medicine · 2024
The grounding for choosing a specific, measurable dietary behavior rather than a general healthy-eating goal.
Review before submission
Common mistakes
- Writing the algorithm about eating healthily in general instead of one defined behavior.
- Splitting precontemplation from contemplation on knowledge or concern rather than intention.
- Omitting the roughly thirty-day commitment that marks preparation.
- Treating maintenance as a feeling of confidence rather than six months of sustained behavior.
- Submitting questions with no routing, so two answer paths land on different stages.
- Summarizing the experience without naming the stage identified for each person.
Submission checklist
- One specific dietary behavior named and used consistently across all five questions.
- Five questions, each testing a single boundary, with the routing drawn out.
- All five stages reachable: precontemplation, contemplation, preparation, action, maintenance.
- Both people's stages stated, with the answers that produced each assignment.
- Summary covers where the wording proved ambiguous in practice.
Use this guide to plan and review your own work. Follow your institution's rules and read our academic-integrity policy.

Written by
Aaron Bishop
MA, Education
assignment interpretation and research-methods coaching across disciplines
Aaron leads the EssayCrackers editorial desk. He works on how assignment briefs are read — what a rubric is actually asking for, and where students most often answer a different question than the one set.

Reviewed by
Dr. Nathan Cole
PhD, Rhetoric & Composition
Argumentation and thesis development
Nathan teaches first-year composition and directs a university writing center. He reviews EssayCrackers guides for argumentative soundness and citation accuracy.