Progressive disclosure is a great idea fraught with implementation
issues. 

For starters, you usually need client side scripting to do it, which
reduces its accessibility.

The other big problem is what you've touched on - user attention. On
the one hand, you need to avoid people missing the 'new' questions
but on the other hand you might have users being 'surprised'. 

One way to overcome all these problems is to use pagination. If you
ask 'set up' questions on your first screen, you can then provide
the appropriate (conditional) questions on the next and later
screens. No scripting needed, no surprises, no chance of missing
relevant questions. 

One of the main /disadvantages/ of this approach is that the form may
not lend itself neatly to pagination. 


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Posted from the new ixda.org
http://www.ixda.org/discuss?post=25866


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