Focus + context

An idea you already use

Think about reading a map while driving. You need the next turn in detail, and you also need a rough sense of where you are in the city. Or think about your own eyes: only a small spot at the center of your vision is sharp, yet you stay aware of the whole room. Your brain blends the two into one seamless picture.

Focus + context asks computers to do the same thing: show what you’re working on clearly, and keep its surroundings in view so you never lose your bearings.

The problem it solves

There is always more information than screen. For most of computing history, there have been two ways to cope, and each has a cost. Zoom in, and you see the detail but lose the big picture. Open a separate overview, and you keep the big picture but spend your time glancing back and forth between two views.

Researchers call these zooming and overview + detail. Focus + context is the third approach: show the detail and its surroundings together, in one continuous view.

Where the idea came from

Focus + context grew out of a handful of research labs that also shaped the modern computer, and it has been refined ever since.

1. 1982

   The Bifocal Display

   At Imperial College London, Robert Spence and Mark Apperley pictured an office of the future where your documents sat side by side on one long strip. The part you were reading appeared in full. Everything else was squeezed to the left and right, still visible, like the edges of a bookshelf seen at an angle.

2. 1986

   The “fisheye view”

   At Bell Labs, George Furnas noticed that people naturally think in a fisheye way: what’s nearby in great detail, what’s far away only if it’s important. His 1986 paper, Generalized Fisheye Views, turned that intuition into a simple formula a computer could use, and it became the field’s most influential starting point.

3. 1991–1995

   A burst of invention at Xerox PARC

   The lab that helped invent the graphical desktop produced a run of landmark designs: the Perspective Wall, which folded a long timeline into a 3D wall; the Document Lens for long reports; the Table Lens for spreadsheets; and the Hyperbolic Browser for enormous hierarchies. Researchers at Brown University and Digital Equipment Corporation built fisheye “lenses” for diagrams around the same time.

4. 1999

   A cornerstone of a new field

   Readings in Information Visualization, the book that defined information visualization as a discipline, made focus + context one of its central ideas and stated its core premise plainly: people need the detail and the bigger picture at the same time.

5. 2000–2004

   From documents to the desktop

   Researchers began applying the idea to the desktop itself. Microsoft Research’s Task Gallery put your current task on a central “stage” with your other tasks around it. Patrick Baudisch, then at Xerox PARC, embedded a sharp monitor inside a huge, lower-resolution projected screen, so you could see a whole document while reading one part closely. Microsoft’s Scalable Fabric kept active windows in the middle of the screen and shrank the rest toward the edges.

6. 2000s–today

   Into everyday products

   Fisheye magnification has been part of the Mac since the early days of Mac OS X, when Dock icons began to swell as the pointer passed over them. In 2022, Apple introduced Stage Manager, which keeps one app at center and shows recent apps as small thumbnails along the side.

7. Today

   FocalContextual

   OpenWorkspace applies focus + context to the desktop as a whole: a stable place for your primary work, with supporting windows and thumbnails of them arranged freely around it, saved together as a Workspace.

What the research found

• It works when context matters

  In a 2002 study, people using a focus + context screen finished two tasks, finding the shortest route on a map and verifying connections on a circuit board, 21% and 36% faster on average than with overview + detail or zooming. In a driving simulation, they made fewer than a third as many errors as with a separate overview. (Baudisch et al., 2002)

• Squeezing has a price

  Shrinking and stretching content to fit can make it harder to read and to find things. For picking a known item from a menu, an ordinary menu beat a fisheye menu. (Hornbæk & Hertzum, 2007)

• Context needs good cues

  Eye-tracking studies at Xerox PARC found the benefit depends on how clearly the surroundings signal what’s there. Context only helps if you can tell what it holds. (Pirolli et al., 2001)

• More room helps

  Microsoft Research found significant productivity and satisfaction gains when people did complex, multi-app work on a larger display. (Czerwinski et al., 2003)

The field’s standard survey, published in 2009, found that each approach has strengths and weaknesses, and that the right one depends on the task (Cockburn et al., 2009). The research is still active: a 2025 review examined 101 visualization techniques that reveal or condense information while preserving the overall context (Bludau et al., 2025). The lesson: keep context in view, but don’t mangle it to get it there.

Where FocalContextual fits

Most focus + context designs were invented when screens were small. Early designs often compressed the surrounding view or showed fewer items.

In 2001, Patrick Baudisch, Nathaniel Good, and Paul Stewart tried a different approach. Their focus plus context screen varied resolution while preserving scale: the surroundings were less sharp, but nothing was squeezed or warped (Baudisch et al., 2001). Three years later, Baudisch co-authored Microsoft Research’s Scalable Fabric, which carried the idea into desktop window management, with active windows in a central area and the rest gathered around the edges (Robertson et al., 2004). Today’s larger, higher-resolution displays leave more room for that surrounding context.

FocalContextual applies focus + context to the desktop itself:

• Focal Panels give your primary work a stable place on screen that you choose.
• The Contextual Region surrounds it. Supporting windows and thumbnail-sized images of them occupy this region, where they can be sized and positioned freely.
• Shifting focus means bringing a supporting window into a Focal Panel when it becomes the main thing. When you’re done, it goes back to where it was.

Save the arrangement as a named Workspace and you can restore supported windows in their saved positions when you return.

Sources

Selected from the most-cited and peer-reviewed work on the subject.

1. Spence, R., & Apperley, M. (1982). Data base navigation: An office environment for the professional. Behaviour & Information Technology, 1(1), 43–54.Introduced the Bifocal Display: a detailed central strip flanked by compressed context.
2. Furnas, G. W. (1986). Generalized fisheye views. Proceedings of CHI ’86, 16–23.Formalized the degree-of-interest function, the field’s most-cited foundation.
3. Mackinlay, J. D., Robertson, G. G., & Card, S. K. (1991). The Perspective Wall: Detail and context smoothly integrated. Proceedings of CHI ’91, 173–176.Xerox PARC: folds a long timeline into a 3D wall with a detailed center panel.
4. Rao, R., & Card, S. K. (1994). The Table Lens: Merging graphical and symbolic representations in an interactive focus + context visualization for tabular information. Proceedings of CHI ’94, 318–322.Focus + context for spreadsheets and large tables.
5. Lamping, J., Rao, R., & Pirolli, P. (1995). A focus+context technique based on hyperbolic geometry for visualizing large hierarchies. Proceedings of CHI ’95, 401–408.The Hyperbolic Browser; among the best-known focus + context systems.
6. Card, S. K., Mackinlay, J. D., & Shneiderman, B. (Eds.) (1999). Readings in Information Visualization: Using Vision to Think. Morgan Kaufmann.The field’s defining anthology; gave “focus + context” its canonical framing.
7. Robertson, G., van Dantzich, M., Robbins, D., Czerwinski, M., Hinckley, K., Risden, K., Thiel, D., & Gorokhovsky, V. (2000). The Task Gallery: A 3D window manager. Proceedings of CHI 2000, 494–501.Microsoft Research: the current task on a central stage, other tasks in the periphery.
8. Pirolli, P., Card, S. K., & Van Der Wege, M. M. (2001). Visual information foraging in a focus + context visualization. Proceedings of CHI 2001, 506–513.Eye-tracking showed the benefit depends on how well context cues signal what lies there.
9. Baudisch, P., Good, N., & Stewart, P. (2001). Focus plus context screens: Combining display technology with visualization techniques. Proceedings of UIST 2001, 31–40.A sharp display embedded in a large low-resolution one: focus + context without distortion.
10. Baudisch, P., Good, N., Bellotti, V., & Schraedley, P. (2002). Keeping things in context: A comparative evaluation of focus plus context screens, overviews, and zooming. Proceedings of CHI 2002, 259–266.Measured gains over overview + detail and zooming on real tasks.
11. Czerwinski, M., Smith, G., Regan, T., Meyers, B., Robertson, G., & Starkweather, G. (2003). Toward characterizing the productivity benefits of very large displays. Proceedings of INTERACT 2003, IOS Press.Found significant productivity and preference benefits from larger display surfaces.
12. Robertson, G., Horvitz, E., Czerwinski, M., Baudisch, P., Hutchings, D., Meyers, B., Robbins, D., & Smith, G. (2004). Scalable Fabric: Flexible task management. Proceedings of AVI 2004, 85–89.Desktop focus area with a periphery of shrunken windows, grouped into tasks.
13. Hornbæk, K., & Hertzum, M. (2007). Untangling the usability of fisheye menus. ACM Transactions on Computer-Human Interaction, 14(2), Article 6.A useful counterweight: for known targets, hierarchical menus won.
14. Cockburn, A., Karlson, A., & Bederson, B. B. (2009). A review of overview+detail, zooming, and focus+context interfaces. ACM Computing Surveys, 41(1), 1–31.The standard survey of the field and its evidence.
15. Bludau, M.-J., Dörk, M., Bruckner, S., & Tominski, C. (2025). Fluidly revealing information: A survey of un/foldable data visualizations. Computer Graphics Forum, 44(3).Reviewed 101 techniques that reveal or condense information while preserving context.
16. Apple (2022). macOS Ventura brings powerful productivity tools and new Continuity features to Mac. Apple Newsroom, June 6, 2022.Introduced Stage Manager: a centered window with recent apps along the side.