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Prompt Design: Goal, Context, Format, Limits

Turn vague requests into clear prompts using a four-part checklist, then improve results by iterating.

  • 7 min
  • +50 XP
  • 2 knowledge checks

By the end of this station, you can:

  • Use the Goal, Context, Format, Limits checklist to write a prompt
  • Rewrite a vague prompt into a specific one
  • Improve a response by giving feedback and examples

Vague in, vague out

An AI assistant can only work with what you give it. Ask "help me with my essay" and it has to guess what essay, what kind of help, and how much. Guesses lead to generic answers.

Good prompting isn't about magic words. It's about giving the same information you'd give a helpful tutor who has never met you.

The GCFL checklist

  1. Goal — what do you want?

    Say the task clearly: explain, compare, quiz me, give feedback, brainstorm. "Give feedback on my thesis statement" beats "look at this."

  2. Context — what should it know?

    Share your class, level, topic and situation: "I'm in 10th-grade biology and we just started cell respiration."

  3. Format — what should the answer look like?

    Ask for a shape: a table, 5 bullet points, a step-by-step list, a short paragraph, or practice questions with an answer key.

  4. Limits — what are the boundaries?

    Set length, reading level and rules: "under 150 words," "don't rewrite my sentences, just point out problems," "use only the text I pasted."

Same request, two prompts

Vague prompt

  • "Explain photosynthesis."
  • No level given, so the answer may be too simple or too technical
  • No format, so you may get a long wall of text
  • No purpose, so it can't focus on what you actually need

GCFL prompt

  • Goal: "Help me review photosynthesis for a quiz."
  • Context: "I'm in 9th-grade biology and I get confused about light vs. dark reactions."
  • Format: "Use a two-column table, then give me 3 practice questions."
  • Limits: "Keep it under 200 words and don't show answers until I ask."

Interactive lab

Prompt Builder

Start with a vague prompt, then add ingredients from our GCFL framework: Goal, Context, Format, Limits. Watch the prompt and the example response change.

Your prompt

Help me with my essay.

Prompt strength: 0 / 4

Example response (pre-written for this lab)

Sure! I'd be happy to help with your essay. Good essays usually have an introduction, body paragraphs, and a conclusion. Make sure your writing is clear, check your grammar and spelling, and support your points with evidence. What is your essay about?

Why: Generic advice. The AI has to guess what you need, so it gives everyone the same answer.

What to notice: Each ingredient removes guesswork. Goal and Context make the answer specific, Format makes it usable, and Limits keep the AI helping you instead of doing the work for you.

Knowledge check 1

+10 XP on first try
Maya writes: "Write about the Civil War." Which addition would improve her prompt the MOST for studying?

Prompting is a conversation, not a single shot

Your first prompt rarely gets a perfect answer — and that's normal. Treat the response as a draft and steer it: "Shorter," "Use an example from sports," "That's too advanced, explain it like I'm new to this."

Two more power moves: show an example of what you want ("Format the flashcards like this: Term — definition"), and ask the assistant to ask YOU questions first ("Before you start, ask me 3 questions about my project").

ExampleLetting the AI interview you first

You

I need to give a 3-minute presentation for my environmental science class. Before suggesting a topic, ask me three questions to figure out what I'd be interested in.

AI assistant (sample)

Happy to help! 1) Are you more interested in local issues (like your town's water or parks) or global ones (like oceans or climate)? 2) Do you prefer topics with lots of data and graphs, or ones with personal stories? 3) Is there a hobby or place you care about that we could connect to the environment?

Why it matters: Instead of guessing, the assistant gathers context first. Your answers make the next suggestions far more personal and useful.

Key terms

Iteration
Improving a result through repeated rounds of feedback and revision, such as refining a prompt based on the last response.
Few-shot prompting
Including a few examples of the input and output you want in your prompt so the AI can follow the pattern.

Knowledge check 2

+10 XP on first try
You asked for a study guide and the answer is way too long and advanced. What's the most effective next step?

Sources for this lesson

  • University of Helsinki and MinnaLearn. Elements of AI. Full citation

Finish this station

Answer every knowledge check (right or wrong) to unlock completion.

  • Knowledge check 1 — not answered yet
  • Knowledge check 2 — not answered yet

0/2 checks answered