Multi-tasking is illusory

Multi-tasking is illusory

Do two things at once?  Samsung Galaxy Note II advertisement billboard outside Kings Cross Station, London

There is a billboard covering a building outside London’s Kings Cross Station. It proclaims: “Multi window: do two things at once.”

The product is the Samsung Galaxy Note II LTE. The feature it describes is the ability, in certain apps, to split the screen between, say, a video in the top half and a web page in the bottom half.

Will this make users twice as fast? Unlikely.

Multi-tasking is illusory. Try watching a video while reading a document at the same time. Stop, and try to recall the last few words that were spoken in the video or written in the document.

Advances in processors and network speeds enable several concurrent functions on a device, or across multiple devices, but the brain itself is unable to absorb them. Instead of multi-tasking in parallel, the brain switches between the different tasks more rapidly, but does so to the detriment of attention levels.

It is a state known as continuous partial attention.

Mobile devices, used in isolation, have hitherto been free from this because it was impractical to have multiple tasks in the foreground on a small screen. However, the increasing pixel density of displays and larger physical screen sizes has brought multi-window environments close to theoretical feasibility on mobile phones.

Designing for continuous partial attention is something we’ve been looking at for some time as part of MEX Pathway #2, entitled: ‘Advance best practice for multi-touchpoint experience design‘. At first glance it may seem to be a challenge of making design choices better suited to partial attention states, but it also raises the question of whether it is, in fact, more sensible to create experiences which disallow partial attention altogether?

Multi window on the Note II would seem to be a step in the opposite direction.


Add yours
  1. 1
    Doug Reeder

    There are single activities that require two apps on the screen at once. For example, one might want to compose an e-mail while reading figures from a spreadsheet, or calculate price comparisons while shopping on-line. So there are legitimate use cases for two apps on the screen at once.

    And this isn’t even a first for a smartphone; webOS has had this capability since June of 2009:

    • 2
      Marek Pawlowski

      Good point Doug. I wonder what other use cases could drive this for user benefit, rather than just adding to distraction levels. Didn’t know about that Palm thing either. Was that on Pre or just TouchPad?

  2. 3
    Doug Reeder

    Desk accessories on webOS work on everything from the Pre to the TouchPad; they’re limited to the width of the Pre’s screen, but can vary in height. If more than half of a phone’s screen is taken up, the main app typically is not usable, so any given desk accessory tends to be useful on either phones or the TouchPad. Even a calculator takes up a lot of screen real estate, just to have buttons of reasonable size:

  3. 4
    Doug Reeder

    In a Xerox PARC study of “Critical Incidents on the Web”, cited by Jakob Nielsen on April 15, 2001, 51% of users’ “critical” tasks were classified as “Evaluate multiple products or answers to make a decision”, i.e. combine information from multiple sources:

    Today, Nielsen posted a review of Windows 8, criticizing it for sharply limiting users’ ability to use several windows:

    (I should mention that you’re correct that a lot of people abuse multiple windows to distract themselves.)

+ Leave a Comment