> For the complete documentation index, see [llms.txt](https://www.designreference.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/hook-model.md).

# Hook Model

The Hook Model is a cyclical process that businesses use to create habit-forming products. 

It begins with a trigger, an external prompt or internal cue that prompts a user to take action. This action, made simple and effortless by the product design, leads to a variable reward, a satisfying or surprising outcome that keeps the user engaged. 

The user then invests in the product, perhaps by creating content or connecting with others, deepening their engagement and making future returns more likely. This cycle repeats, with each iteration reinforcing the habit and drawing the user back to the product.

#### Further Reading

{% embed url="<https://www.productplan.com/glossary/hook-model/>" %}

{% embed url="<https://uxdesign.cc/what-budgeting-apps-fitness-trackers-and-duolingo-have-in-common-and-why-theyre-so-addictive-577bf6de5c0d>" %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/hook-model.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.