"I have been doing research since 1990, and I didn't understand what job seekers did on a day-to-day basis, " says Wanberg, a professor of human resources and industrial relations at the University of Minnesota.

FORBES: 13 Big Mistakes Job Seekers Make

Roger Seifert, professor of industrial relations and human resources management at the University of Wolverhampton, estimated that about 90% of all schools and colleges in England would be closed on Wednesday due to industrial action.

BBC: Head teacher praised by David Cameron to strike