Their study found that flextime largely reduced unpaid absences for employees. Flextime could impact coordinating schedules and meetings, as employee work schedules may vary. Examples of such programs include flextime, workplace wellness, and family support. For employers, flextime can aid the recruitment and retention of staff. Shift workers are generally excluded from flextime schemes as are senior managers. Flextime can give employees greater freedom to organize their working lives to suit personal needs. However, contingent contracts can often include negotiations regarding flextime, job sharing, responsibilities, etc. Flextime is also beneficial to workers pursuing an education. It is the workplace equivalent of the workforce policy of flextime and flexbenefits. Flextime allows workers to change their start and end work time. MassMutual began to offer flextime for employees in 1968. They first analyzed a wide range of studies done on flextime. The idea of flextime was invented by Christel Kammerer. Players choose either a short or long game, and adjust the Flextime game board.