A major new development in systems of work in Britain is taking place. (1)_______________________. In 1973, over 500 organizations had adopted the idea, and by 1974, its number had risen to over 200,000.Flexible working hours were invented in Germany in the late 1960's, but reached Britain only in 1972. (2)_______________________. These are, firstly, that all workers must be present for certain “key” times in a day and secondly, that all workers must work an agreed total number of hours per week.The system has proved an almost total success wherever it has been tried. A survey of 700 workers on flexible hours showed 3 main advantages: a better balance between working and private life, avoidance of the need to travel during rush hours and the ability to be able to finish a certain task before leaving.(3)_______________________.