Question

a. When considering work measurement methods for determining time standards, there are several alternatives to time study. MOST is a specific example of which alternative to time study? Briefly explain in what situations one would choose between MTM-HC, MODAPTS and MOST.

b. Twenty cycles have been observed during the pilot time study. From this pilot study, the mean time for the longest element was found to be 0.75 min, and the standard deviation calculated on the same data was found to be 0.22 min. If the analyst wants to be 95% confident that the mean of the sample was within ±10% of the true mean, how many observations should be taken?

c. The observed times for six work elements are given in the table below. Element C is a machine controlled element and the time is constant. Elements A, B, D, E, and F are operator controlled and they were performance rated at 90%. If the machine allowance is 15%, and the worker PFD allowance is 25%, determine normal time and standard time for the cycle.

Element	A	B	C	D	E	F
Observed time (min)	0.18	0.30	0.88	1.12	2.55	1.80

d. If the standard time to complete a particular welding operation is 25 minutes, and a particular welder completes 16 operations during his shift, what is his efficiency? (His work hours are 06:00 – 14:30, he has 30 min for lunch and two 15 min breaks during the shift.)

Answer 1

Answer a:

MOST, whose full form is Maynard operation sequence technique is a specific example of “predetermined motion time systems” alternative to time study.

Methods-Time Measurement (MTM) is a predetermined motion time system that is used primarily in industrial settings to analyze the methods used to perform any manual operation or task and set the standard time in which a worker should complete that task.

MODAPTS is a form of shorthand language that describes the sequence of body actions involved in carrying out particular task.

Maynard operation sequence technique (MOST) is a predetermined motion time system that is used to set the standard time in which a worker should perform a task.