Critical reasoning week 1 journal: defining the subject
A reflective journal of two to three pages responding to three prompts after reading chapters one to three and participating in the week's discussion: your own brief definition of critical thinking in four to six lines, why the authors describe chapters twelve to fourteen as the heart of the matter, which two concepts those chapters emphasise, how you define those concepts and why the authors find them important, and your greatest challenge for the session and for this class with how the first three chapters' concepts could help you meet it.
Editorial process
Last reviewed · August 13, 2026
Think more than you write
The journal's own instructions tell you what it is for and it is worth taking at face value: you will probably do as much or more thinking than writing, and if you write long reflections you should then edit them down to their essence. That is a real instruction about method rather than a courtesy. It means the marks are not for volume, and a journal that reaches the page requirement by restating the readings has misread the assignment. It also warns you against the easy failure on the first prompt, which is copying one of the many definitions of critical thinking available online; the instruction says explicitly not to be tempted, and to form your own so that it is meaningful to you. Four to six lines is very short, which is the constraint that makes it hard. Plan what you want to say before you start writing, since the editing down is where the work happens.
Writing your own definition in four to six lines is genuinely difficult and the difficulty is the exercise. The published definitions each foreground something different: the disciplined evaluation of reasoning, reflective judgement about what to believe or do, the identification and assessment of assumptions, or a set of dispositions rather than a skill. Read a few, notice what each includes and excludes, then decide what you think is central and write it in your own words. A useful test is whether your definition rules anything out, since a definition that covers all careful thought is not doing work. It also has to be a definition you can live with, because the instruction says you will carry it with you through the course and it will be judged against how you actually reason in later weeks. Write it long first and then cut, which is the method the instructions themselves recommend.
The second prompt asks you to infer something from what you have read so far, which is why it says considering just what is in this week's readings. The authors are pointing forward to chapters you have not read, so you are being asked to reason from the foundations laid in the first three chapters to what those later chapters must be about. Two moves are needed. First, identify the two concepts the authors say those chapters emphasise, which the text names and which you should take from the text rather than guess. Second, explain why they would be the heart of the matter given what chapters one to three have established. That second part is the actual thinking; the first is a comprehension check, and a journal that answers only the first has done half the prompt. Say what the first three chapters set up that the later ones would need, since that is the inference being asked for.
Defining those two concepts in your own words is a separate instruction from naming them, and the journal asks how you define them. Do not simply reproduce the text's definition, since the exercise mirrors the first prompt: understanding is demonstrated by restatement in your own terms, and by being able to say what would count as an instance and what would not. Then say why the authors find them important to critical thinking specifically rather than to reasoning in general. If the two concepts turn out to be the ones the whole book is building towards, say what the earlier chapters were doing to prepare for them, because seeing a text's architecture is exactly the kind of reading this course is trying to teach. Give an example of something that would count and something that would not, since that is the clearest test of a definition.
The third prompt is the reflective one and it asks for three things: your greatest challenge for the session in general, your challenge for this class in particular, and how the first three chapters' concepts could help you meet those challenges as well as challenges in your personal life as a family and community member. Be specific rather than modest: time management, unfamiliarity with formal reasoning, difficulty separating a claim from the person making it, or a tendency to argue for positions you already hold. Then apply an actual concept from the reading, naming it, which is what distinguishes reflection from confession. On execution, keep to two to three pages excluding title and references pages, one inch margins, double spaced, twelve point Times New Roman, with a title page and a references page as needed, and cite anything beyond the textbook properly. Name the concept and say how you would use it, rather than gesturing at the reading in general.
Likely learning objectives
Inferred from the brief — check these against your own rubric.
- 01Write a definition of critical thinking that rules something out.
- 02Compare published definitions before forming your own.
- 03Infer from the early chapters what makes the later ones central.
- 04Restate concepts in your own terms rather than reproducing the text.
- 05Identify a specific rather than a modest challenge.
- 06Apply a named concept from the reading to that challenge.
Read the full question
Review every instruction before using the planning guidance that follows.
Turn the brief into deliverables
- 01Your own definition of critical thinking, in four to six lines.
- 02Why the authors see chapters twelve to fourteen as the heart of the matter.
- 03The two concepts those chapters emphasise, taken from the text.
- 04Your own definitions of those two concepts.
- 05Why the authors find them important to critical thinking.
- 06Your greatest challenge for the session and for this class.
- 07How the first three chapters' concepts could help you meet those and personal challenges.
- 08Two to three pages, double spaced, twelve point Times New Roman, with title and references pages.
Three prompts, three answers
Defining critical thinking
Four to six lines, in your own words, that exclude something.
How you arrived at it
What published definitions include and exclude, and what you kept.
The two concepts
Named from the text, with the authors' emphasis identified.
Your definitions of them
Restated in your terms, with instances and non-instances.
Why they are the heart of the matter
Inference from what chapters one to three established.
Your challenge this session
A specific difficulty, honestly stated.
Your challenge in this class
What about critical reasoning in particular is hard for you.
Applying the concepts
Named concepts from the first three chapters brought to those challenges and to personal life.
The text first, definitions second
Recommended databases
- The course textbook, chapters one to three
- The week's discussion posts
- Stanford Encyclopedia of Philosophy
- Internet Encyclopedia of Philosophy
Search sequence
- 1.Read chapters one to three and note what the authors say about chapters twelve to fourteen.
- 2.Identify the two concepts by name from the text before doing anything else.
- 3.Read two or three published definitions of critical thinking and note what each excludes.
- 4.Reread the week's discussion, since the prompt says the journal follows from participation in it.
- 5.Draft your definition long, then edit it down to four to six lines as the instructions direct.
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
Critical Thinking
Stanford Encyclopedia of Philosophy · 2022
Several published definitions with what each includes and excludes, which is the comparison the first prompt requires.
- 02
Informal Logic
Stanford Encyclopedia of Philosophy · 2024
The evaluation of arguments in natural language, which is usually what the later chapters of such a text are building towards.
- 03
Fallacies
Stanford Encyclopedia of Philosophy · 2024
A likely candidate for what the emphasised concepts connect to, and useful for defining them in your own terms.
- 04
Epistemology
Stanford Encyclopedia of Philosophy · 2020
What it is for a belief to be justified, which is the background question behind any definition of critical thinking.
Review before submission
Common mistakes
- Copying a definition found online, which the prompt warns against.
- Writing a definition so broad it excludes nothing.
- Naming the two concepts without explaining why they are central.
- Reproducing the text's definitions instead of writing your own.
- Answering only one of the three parts of the third prompt.
- Giving a modest, generic challenge such as being too much of a perfectionist.
- Reflecting without naming a concept from the reading.
- Padding to the page requirement by restating the chapters.
Submission checklist
- The definition of critical thinking is four to six lines and in your own words.
- It excludes something, rather than covering all careful thought.
- Published definitions were read and compared before writing it.
- The two concepts are taken from the text, not guessed.
- Why chapters twelve to fourteen are central is inferred from chapters one to three.
- Both concepts are defined in your own terms.
- What would and would not count as an instance is clear.
- Their importance to critical thinking specifically is explained.
- A specific challenge for the session is named.
- A specific challenge for this class is named.
- Concepts from the first three chapters are applied by name.
- Personal, family and community application is addressed.
- Two to three pages, one inch margins, double spaced, twelve point Times New Roman.
- Title page and references page are present, with any outside sources cited.
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.