The Formula for Software Quality

How do you define the quality of a software product? There is definitely an intrinsic emotional component to it, which means satisfaction for the user, willingness to pay, appreciation, positive attitude, and all that. However, if we put emotions aside, how can we really measure it? The IEEE says that quality is the degree to which a product meets its requirements or user expectations. But what is the formula? Can we say that it satisfies requirements and expectations to, say, 73%?

[image error]Coco Chan...