21 Oct 2009 - 4:42pm
6 years ago
13 replies
Chad Mortensen

The Perpetual Scrolling Web Pages

I've been noticing more and more Ajax powered pages where at the end
of the normal page end a call is made to fetch more content and is
added to the bottom of the page, in essence making the page longer on
the fly. A good example of this is on
Twitter and Facebook do something similar but a button or link is
needed to expand the content.

I can a usability issue with clicking on a link and then having the
back button not return you to the same 'long' page you left from.

28 Sep 2009 - 7:15am
5 years ago
38 replies
Queen Catherine

Unusable things

OK - so we work in the world of digital. Here the affordance is a
perceived one. But what about our real lives?

Here's the thing - I want to start a list of unusable real life

1. Elevator buttons: when I press the wrong floor (which is quite the
frequent occasion in my uncaffienated state before 12pm) why can't I
"unpress" my mistake?

2. Toilet doors: why does one open in and the next out. Furthermore -
why wash your hands when you must touch germ-ridden door handles after
the fact? If there is ever a need to have automatic doors - here it


19 Mar 2008 - 7:57pm
8 years ago
22 replies
Chris Hlavaty

DEFINE: Affordance

In the discipline of IxD, the word has been used to define a possible
action perceived by a user within some environment (Norman 1988). In the
classic example, the affordance of a door with a flat metal plate is
"push." The affordance resolves to a verb, an action to be performed.

However, of late, I've seen the word used loosely to describe the clues
that suggest an object's possible actions.

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