What benefits do managers (or companies) derive from the application of Information Systems with respect to an in-house payroll system (timesheet transactions; paid time-off; sick leave; hourly, salary, contractor; auto-deposit vs. check; health insurance; educational benefits; etc. - in short, there are a ton of things that are considered in the ACCURATE dispersal of employee pay) and what problems are managers likely to encounter in these applications of payroll functions and subsequent updates and so forth (all the subsidiary elements as partially noted above) of a fully functioning and secure payroll system)?