Over the last six months, New York State's Department of Health has sent letters raising the specter of fines and jail time to six online gene-testing firms that offer consumers the ability to peer into their genome to assess their future risk of getting diseases such as cancer, heart disease and multiple sclerosis.

FORBES: Magazine Article

Hidalgo's team takes a surgical approach to direct marketing--and that means nonstop testing, online and off, of every message that customers see.

FORBES: Entrepreneurs

Aware of the limitations of advertising-supported online video, European media firms are currently testing micropayments for shows.

ECONOMIST: The perils of piracy

At present the system is being used on purpose-built websites with, for instance, online research groups testing the effect of various display ads.

ECONOMIST: Facial monitoring

According to executive director of Government Digital Services Mike Bracken, they performed online surveys, as well as face-to-face and remote user testing.

FORBES: The New Gov.UK (And The Style Guide Behind It)

To take a notable example, people from the biggest of the massive open online course platforms, Coursera, often talk about how exciting it is that they can do A-B testing to learn what works.

FORBES: Why Don't Entrepreneurs And Learning Scientists Talk Much?

Coursera, recently founded by Stanford professor Andrew Ng, will offer not only free online courses, but also a great deal of individualized instruction in the form of grading, testing, student-to-student help and certificates of completion.

CNN: Do we need a revolution in higher education?