Prompting that actually changes the output

Most prompting advice is folklore. Four things genuinely change what you get back.

There is an industry of prompting tips, most of it superstition. The tricks that circulate — promising a tip, threatening consequences, telling it it is an expert — mostly do not survive being tested.

Four things do work, and they are unglamorous.

1. Give it the material

The single biggest improvement available to almost everyone: stop asking it to know things, and start giving it things to work from.

Weak:

Summarise the state of the housing market.

Strong:

Here is an article. Summarise the three claims it makes about prices, and note which ones it supports with data.

[Paste the article.]

The second version is better for a structural reason rather than a stylistic one. Asked to know, the model draws on vague recollection and invents the specifics. Given the text, it is doing something it is genuinely good at — transforming material in front of it.

This is also why retrieval exists as a technique: it is the same idea, automated.

2. Be specific about the output, not the input

Most people describe what they want about; far fewer describe what they want back.

Useful things to specify:

Length — "in under 150 words" works far better than "keep it short"
Format — "as a table with three columns", "as a numbered list", "as JSON"
Audience — "for someone who has never used one", "for my manager, who knows the project"
What to leave out — "no preamble, no summary at the end"
What good looks like — "like a colleague explaining it in a lift"

That last one is unusually effective. Describing a style by comparison gives the model something concrete to match.

3. Show it one example

If you want a particular shape of output, give one example of that shape and say "like this".

One example typically beats a paragraph of description, because it removes ambiguity instead of adding detail. If you have two or three examples of what you want, use them.

4. Iterate instead of perfecting

People spend a long time crafting the perfect opening prompt. It is usually faster to start with something rough and correct it in two or three replies.

Useful follow-ups:

"Shorter — half the length."
"Too formal. Make it sound like a person."
"You invented the second figure. Remove anything you are not certain of."
"Which parts of that are you least confident about?"

The last one is worth using routinely. It often surfaces exactly the part that was made up.

What does not work

The folklore, briefly:

"You are a world-class expert in…" — fashionable, and the measured effect is small. The specificity of your request matters far more than the flattery.
Offering a tip or a reward — occasionally changes tone, not accuracy.
Threats and ultimatums — same.
Magic phrases — "take a deep breath", "this is important to my career". There is no reliable evidence these do anything beyond changing the writing style.
Being rude or polite — the polite version is not more accurate. It is just nicer to read.

If a prompting tip comes with a dramatic claim and no way to test it, treat it as folklore.

The honest summary

Prompting is not a dark art with secret incantations. It is writing a clear brief, which is a skill you already have from working with people.

The useful question is never "what magic words" but:

What would I need to tell a competent freelancer, who knows nothing about my situation, to get this right the first time?

Answer that, and you have written a good prompt.