25. What is a differential piece-rate?
26. What is the best way of getting the men to arrive on time in the morning?
27. Why is it easier to estimate cost of work to be done by the daily men, than that to be done by the monthly men?
28. How many men can a foreman supervise while he is doing work himself?
29. What is lost foreman's time?
30. What are the advantages and disadvantages of punch-cards as against time-keepers' slips?
31. How many men, ordinarily, can one foreman efficiently supervise in the field?