While most employers still allocate paid leave for workers by type, such as sick leave or vacation time, an increasing share are moving to a paid time off bank (PTO) system, in which employees have a set number of days of leave they may use for any reason, according to survey results released June 30 by WorldatWork.

The survey, conducted between Feb. 17-March 5 among 1,036 human resources professionals who were members of the Scottsdale, Ariz.-based HR organization, found that...