# softwarebehavior.com

> Software Behavior by Joost van der Zwan, a Studio JZ field book: how software should behave, with research-backed Field Notes, the 15 frameworks from the book The Product Architect, and the Field Kit of skills.

## Field Notes
- [JZ-002 First impressions](https://softwarebehavior.com/notes/jz-002.md): people judge visual appeal in 50 ms, so layout and color work before any copy is read · Lindgaard et al. (2006)
- [JZ-003 Line length](https://softwarebehavior.com/notes/jz-003.md): long lines are read faster, but about 55 characters per line is understood better · Dyson and colleagues (1998–2004)
- [JZ-004 Pretty feels easier](https://softwarebehavior.com/notes/jz-004.md): how easy a screen looks follows its beauty and familiarity, not usability rules · Kurosu & Kashimura (1995); Tractinsky (1997)
- [JZ-005 Show the work](https://softwarebehavior.com/notes/jz-005.md): showing the real work makes a wait feel worth more · Buell & Norton (2011)
- [JZ-006 One mistake](https://softwarebehavior.com/notes/jz-006.md): people abandon an algorithm after seeing it err, and come back when they can adjust it · Dietvorst et al. (2015, 2018)
- [JZ-007 Two free stamps](https://softwarebehavior.com/notes/jz-007.md): progress that has already started makes people more likely to finish · Nunes & Drèze (2006)

## Field Kit
- [All skills](https://softwarebehavior.com/field-kit): install the notes as skills for your AI tools
- [Design review skill](https://softwarebehavior.com/skills/studio-jz-design-review.zip): review a screen or flow against the notes and frameworks
- [Connector](https://www.softwarebehavior.com/mcp): MCP server with search_notes, get_note and review_design

## Book and frameworks
- [The book](https://softwarebehavior.com/book): The Product Architect, a digital field book about designing software behavior in AI-assisted products
- [Frameworks](https://softwarebehavior.com/frameworks): 15 frameworks from the book

## Credit
Software Behavior Field Notes by Joost van der Zwan · Studio JZ · CC BY 4.0 · softwarebehavior.com