By correcting usability problems in design phase, American Airlines reduced the cost of those fixes by 60-90%.[9]

The majority of software lifecycle costs (approximately 80 percent) occur during the post release maintenance phase [10]

In the post-release maintenance phase, researchers found that developers spend most of their maintenance time on issues directly related to unmet or unforeseen user need.[11]

Correcting a system after release can be 100 times more costly than correcting them prior to release.[12]

The three major reasons that a project will succeed are user involvement, executive management support, and a clear statement of requirements. [13]

One usability problem with a printer installation driver caused over 50,000 customer support calls at a cost of over $500,00 a month.[14]

The cost of providing telephone support for computer software has been estimated between $12 and $250 per call, depending on the organization.[15]

At AT&T, the company saved 2.5 million in training expenses as a result of usability improvements.[16]

End user training for a usability engineered system can be one hour, as compared with the usual one week.[17]

Products that are designed from clear customer requirements require less time for training and documentation because the entire system is based on users’ goals, which makes the product easier to describe and less prone to inaccuracies.[18]