Why speech?

Natural

Hands Free

No screen needed

No keyboard

No mouse

Magic - action at a distance

talk is cheap

It’s easy, almost effortless

Our preferred way of communicating

In fact, we love to do it all the time 

Some of us can’t stop 

The easiest form of work 

One of the first things you learn 

and probably the last thing you will do

ease of use

​voice allows zero-click interface 

effortless 

No clicking, no typing, just say the magic words

No reading, just listen

voice commands

Very hard to do well

Frustrating for users

To reduce errors, we have to limit vocabulary 

The user has to know or guess the available commands 

Big penalty for getting a command wrong 

Errors in speech recognition cannot be avoided

User errors are also unavoidable

error correction

command line

1. up arrow
2. arrow left
3. type over the error
4. submit

voice

1. repeat entire command until it is recognized