On May 13, 2008, at 1:25 PM, Peyush Agarwal wrote:
3. Humans work better by recognition rather than recall. Visual UI's
aid recognition, while voice UI basically requires good recall.
You'd have to remember the exact command that'd generate desirable
response or else you're back to #2.
4. This is one of the biggest drawbacks of voice based interaction
with a computer - it is essentially serial, as opposed to visual UI
which is parallel. This is one of the reasons why I think the
iPhone's visual vmail was such a hit. In this respect, the computer
would really need to get to the level of a human-human interaction -
just "knowing" when to interrupt and when to get interrupted in
order to carry a serial interaction with almost parallel efficiency.
"Almost parallel efficiency" is indeed the key victory condition for
voice UI.
Even at 99.99% voice recognition reliability (plus the absurd 100%
natural language parsing reliability we see in the movies), every
command interaction that involves a non-trivial, unrecoverable change
in state is going to require a confirmation phase: "I think you said
'Go Left'. Is that correct?"
One-way auditory *signals* are a great thing, even under high-stress
conditions. Two-way auditory *communication* requires a mix of trust
and half-duplex hand-shake negotiation, and that last bit is the deal-
breaker for unreliable computer voice recognition.
-Will
Will Parker
[EMAIL PROTECTED]
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