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For estimating the usefulness of various gatherings of agents, various proportions can be utilized, which are demonstrative of the result/input relationship. For instance, the usefulness of mechanical production system work can be estimated as the result of units each man-hour or the worth of merchandise created per cost of work on the sequential construction system. For studies of productivity for improvement purposes, briefly explain the four types of analysis that can be carried out. no copy-paste, no plagiarism, all four points should be mentioned. (Skip the question if you don't know the answer for 100%, otherwise, I will give 5 dislikes.)