If I Had Not Studied Music, There

Once The Product's Task Is Known, Design The Interface First; Then Implement To The Interface Design.

As Far As The Customer Is Concerned, The Interface Is The Product.

When You Have To Choose Among Methods, Your Locus Of Attention Is Drawn From The Task And Temporarily Becomes The Decision Itself.

If I Had Not Studied Music, There Would Be No Macintosh Computers Today.

The System Should Treat All User Input As Sacred.