upa2007 designing interfaces jenifer tidwell

Designing “Designing

Interfaces:”How Not to Write a Pattern Catalog

Jenifer TidwellUPA 2007Wednesday, June 13

Prologue: a little history

The year was 1997.Read “Design Patterns” (Gang of Four) and “A Pattern Language” (Alexander).

Developers designing UIs…

• They knew the principles of good design.

• They understood the importance of usability testing.

• But they couldn’t get past rote copying.

“Microsoft did it this way, so we should do it this way too.”

Could patterns help?

“These ideas work. Pick what you want from them, and ignore the rest.”

“And by the way, here’s why they work, if you’re curious.”

• Hypertext• Video games• Consumer electronics• Spoken interfaces• Print design• Data visualization• Cartography• etc…Wanted to apply knowledge from other fields

But was it useful?

Sort of.

1999-2002: no work done

• I couldn’t solve certain problems

• Come back to it with a fresh mind

• Learn more about graphic design, industrial design, etc.

Two jobs later…

…and then…

1. Treat it as a fun theoretical exercise.

How Not to Write a Pattern Catalog:

(Design it to be used)

1. Design it to be used


• Prefer concrete to abstract


• Prefer concrete to abstract• The format doesn’t have to be GOF, or Alexandrian, or …

• Examples• Context• Problem• Forces• Solution• Resulting Context

• Diagram• Notes

• Examples• Context• Problem• Forces• Solution• Resulting Context

• Diagram• Notes

• Primary Example

• What• Use When• Why• How• Other Examples

But what about interoperability?…



• The organization just needs to function; it doesn’t have to be perfect

But organization is important!

• Help readers find patterns• Makes a statement about how the patterns should be used

It’s an information architecture problem.

So how should we categorize them?

• By scale?


• By scale?• By user task?


• By scale?• By user task? • By problem statement?

1. What is the basic shape of the content?

2. What is the basic shape of the actions taken with the artifact?

3. How does the content or available actions unfold before the user?

4. How does the artifact generally use space and the user’s attention?

5. How is the content or action organized into working surfaces?

6. How can the user navigate through the artifact?

7. What specific actions should the user take?

etc…


• By scale?• By user task? • By problem statement? • By design stage? …This kind of worked.

1. What Users Do2. Organizing the Content3. Getting Around4. Organizing the Page5. Commands and Actions6. Showing Complex Data7. Getting Input from Users8. Builders and Editors9. Making It Look Good



• The organization just needs to function; it doesn’t have to be perfect

• Don’t sweat the “language” stuff

“The language is a good one … when it is morphologically and functionally complete.

“It is morphologically complete when the patterns together form a complete structure, filled out in all its detail, with no gaps.

“And it is functionally complete when … the patterns, as a system, generate only those forces which they themselves resolve.”

Lowered standard: just make sure patterns link to each other.

• Is-a• Leads-to• Alternative-to• Works-well-with• etc.


2. Write it for all designers, everywhere.



(Focus on your users)

2. Focus on your users

• Solve the design problems they have

• Not everyone’s• Use vocabulary they know• Use familiar examples

2. Focus on your users

“Microsoft did it this way,

so we should do it this way too.”

•Hypertext•Video games•Consumer electronics•Spoken interfaces•Print design•Data visualization•Cartography•etc…

•Hypertext•Video games•Consumer electronics•Spoken interfaces•Print design•Data visualization•Cartography•etc…

Only MathWorks software.



3. Try to capture all design knowledge as

patterns.




(Other forms can be better)

3. Other forms can be better

When you’ve got a hammer…


• Suggestion, not command• Product, not process• Captures relationships among elements

• Usable across platforms• Clearly improves the user experience

My definition of “pattern:”


• Principles• Heuristics• Style guides and standards• Components• Genres / idioms


Principles:“Make your interfaces easy to learn.”

“Prevent errors.”

Bedrock design conceptsCommands, not suggestionsVery abstract, high-level


Heuristics:“Performance, cost, schedule: pick two.”

“Expand the scope to simplify the problem.”

Strategies for solving problemsCommands, not suggestionsProcess, not product


Style guides and standards:“If an item is too long to fit in the list box, insert an ellipsis in the middle and preserve the beginning and end of the item.”

Design parameters for a class of products

Commands, not suggestionsOften very specific


Components:“Here’s the code for a sortable table.”

“Here’s a set of icons for use in drag-and-drop.”

Individual elements of a UINot relationships among themOften very specific


Genres / idioms:FormInformation graphicSearchable online repository

Categories of UI types; “set the rules”

A context, not a pattern!


What about new innovations?


Another problem: patterns are verbose.

http://www.visual-literacy.org/periodic_table/periodic_table.html


• Tried to “patternize” genres/idioms• Tried to “patternize” information shapes

• Attempted to create too many patterns for controls

• Almost published “Inverted-L” as a pattern

What had I done wrong?…



3. Try to capture all design knowledge as

patterns.

4. Describe the obvious, without offering

any genuine insight.





(Think hard about use contexts)

4. Think hard about use contexts

Problem: You need X.Solution: Use X.

(with apologies to Martijn)

You’re stuck in Obviousland!

Diversion: pattern writing

How I write a pattern:1. Notice a recurring design

element.2. Work up and down the abstraction

ladder.3. Understand why it works.4. Figure out the context -- when

it should or shouldn’t be used.

5. Name it.

This is what gets you out of Obviousland.

Diversion: pattern writing

Pattern discovery in another domain…

Step 1: find a recurring element

What’s common here?• Brown the meat in oil, on high heat

• Remove it before it’s cooked• The rest of the dish involves liquid

• Return the meat to the liquid, eventually

Step 2: walk the abstraction ladder

Up, up, up:• Does it work with vegetables too?• Is the liquid required?• Would dry heat work, instead of frying?

But these seem to lose the “sense of the pattern”

Step 3: why does it work?

Research uncovers “Maillard reactions”…

• Produce hundreds of flavor components

• High heat (360+)• Requires both proteins and sugars

• Deglazing often done too

Step 4: figure out use context

…What, you want me to be a chef too?

Step 4: figure out use context

• We discovered that flavor depth is added

• We ruled out vegetables and delicate oils

• We decided that liquids define the pattern as much as the meat-browning does

Counterexamples?

Step 5: name it

Any ideas?



3. Try to capture all design knowledge as patterns.

4. Describe the obvious, without offering any

genuine insight.

5. Don’t bother with screenshots; they’re too hard.






(Visual examples are critical)

5. Visual examples are critical

•They help you define the pattern



•Put your “evidence” out there




•Explain in pictures, not just words




•Explain in pictures, not just words

•Inspiring in their own right





genuine insight.


6. Just toss it out there with no followup.







(Find out how it’s really used)

6. Find out how it’s really used

Conducted a survey of DI readers to find out how they use patterns

(Not statistically significant)


• 130 respondents• 20 were primarily developers• 50 were designers of some sort• A mix of managers, researchers, etc.

• Majority have been in that role 2-8 years

• But they do many different things…


• Advice on specific design problems

• Learn about UI design• Use examples as “sourcebook”• Terminology for describing design

• Creative inspiration

The book says:

“How often do you or your team refer to the book for advice when you're designing interfaces?”

Total: 80%

Most common answer: “Once or twice during a project” (40%)

“Has the book changed your mind about any design decisions?”

“Yes:” 50%

Sample answers: balanced palette, date choosers, data graphics, page organization

“Identify chapters that taught you something you didn’t know before”

Total: 55%

Most common answer: Chapter 4, “Organizing the Page”


What Users DoOrganizing the Content

Getting AroundOrganizing the PageActions and CommandsShowing Complex Data

Getting Input from UsersBuilders and EditorsMaking it Look Good


…but many respondents said “all” or “none.”

“Have you used the book to help or encourage other people to learn about UI design?”

“Yes:” 70%

“Have you or your team used the book to find or brainstorm new design ideas?”

“Yes:” 65%

“Have you used the pattern names when talking about design?”

Total: 75%

“Have you used the pattern names in design specs or other design documents?”

“Yes:” 35%


• Advice on specific design problems

• Learn about UI design• Use examples as “sourcebook”• Terminology for describing design

• Creative inspiration

…yes, patterns are used in all these ways!


• 2/3 of workplaces “informally encourage use of UI patterns”

• 1/3 formally use patterns “to enforce consistent design”

Some other tidbits…


• Few Hues, Many Values• Right/Left Alignment• Responsive Disclosure• Diagonal Balance• Deep Background

Frequently-named patterns:


• Responsive Disclosure (9 mentions)

• Input Hints (6)• Wizard, Progress Indicator, Row Striping, Liquid Layout, Closable Panels (4-5)

Pattern names used:

6. Find out how it’s really usedOn changed design decisions…

“considering an action panel to replace a convoluted menu system”

“Simplifying color and making the page balance diagonally.”

“Color Coding of pages was a new concept”

6. Find out how it’s really usedOn changed design decisions…

“I've moved away from linear wizards and toward 2-panel selectors, to give users more control over how they work with info or move through a process.”

“It changed my mind about web page organization. I tend to think of them as inherently textual and organize them from left to right. I plan to spend more time considering the graphical nature of the data I'm presenting and thinking about grouping and layout.”


• Good summation or reference for familiar ideas

• Useful as a “memory jogger”• Different platforms: good• More patterns!• More AJAX!

General comments…

6. Find out how it’s really usedGeneral comments…

“Synthesis, reinforcement, clarification: this is what the book was mostly useful for.”

“…it has boosted my design decisions and given me confidence to go ahead with the designs.”

“…many times I think of one way of doing things and after consulting with the book I have new ideas.”


• Patterns are used in the ways we predicted

Conclusions:



• They help both novice and skilled designers

Conclusions:




• Many workplaces are aware of them and use them

Conclusions:




• Many workplaces are aware of them and use them

• Repository of design wisdom, more than a teaching tool (but both)

Conclusions:





genuine insight.


6. Just toss it out there with no followup.







(Find out how it’s really used)

upa2007 designing interfaces jenifer tidwell

Technology

fun theoretical

genres idioms

changed design

specific design

design decisions

spoken interfaces

high heat

genuine insight