man‐monthの英語

語源

Compound of man +‎ month, although, as with any such unit of measure (e.g., pack-years, newton metres), the mathematical relationship of multiplication is simultaneously involved: X men working during Y months = X × Y = Z man-months.

名詞

man-month (plural man-months)

1. One person's working time for a month, or the equivalent, used as a measure of how much work or labor is required or consumed to perform some task.

   Synonym: person-month

   Holonyms: man-year, person-year

   Meronyms: man-hour, person-hour < man day, person-day

   In project management, there is always another dimbulb who will ask whether the relationship of man-months to calendar months is such that the schedule can be cut in half by doubling the headcount. The standard joke for disabusing this nonsense involves an expedited pregnancy lasting four and a half months instead of nine.

   • 1980, Richard S. Palais, “Message from the Chairman”, in TUGboat‎, volume 1, number 1, page 5:

     Experience seems to indicate that developing such a TeX interface for a new output device takes on the order of one man-month.

使用する際の注意点

The distinction of man versus person is usually treated as trivial from the logistical viewpoint (i.e., same difference, within the context), which explains why the man-[time unit] terms are broadly synonymous with the person-[time unit] terms. Many people prefer the person-[time unit] synonym because it easily avoids any doubt about any possibly latent sexism.