Dimensional analysis of motion: VII. Extent and direction of manipulative movements as factors in defining motions.

Visual tracking: IV. Interrelations of target speed and aided-tracking ratio in defining tracing accuracy.

“…The theory just presented also predicts that an aiding device will be of considerable significance in compensatory tracking because in this form of tracking the travel component or rate-control motions have been eliminated in large part by zeroing the target. This hypothetical view of tracking represents an aspect of a general theory of motion that has significance in accounting for many aspects of discrete movements (3,4,11).…”

Stroboscopic Study of Motion Changes That Accompany Modifications and Improvements in a Throwing Performance

“…Gemelli considered gain in skill performance related to an increase in momentum. In the motion research laboratory at the University of Wisconsin, Smith and others (4,6,9,13) indicated that practice affected both manipulation and travel time within a given task. In each experiment, the greatest change due to practice centered around the manipulation aspect (turning a switch or positioning a pin) rather than the travel time (movement from one switch or pin to the next).…”

Dimensional analysis of motion: X. Experimental evaluation of a time-study problem.

“…Figure 3 shows that, during skilled performance, very marked differences occur in a 2 The measures on which the statistical analyses of this experiment are based, along with pertinent summary tables not included in the presentation of the results, have been deposited with the American Documentation Institute. Order Document No.…”

“…Several studies (2,4,5,6,7,8) have been conducted thus far which show that there are grave limitations in the concept of independent movement elements, to which a standard of fixed time can be assigned as a result of measurement. The work thus far conducted along this line has involved observation of the differential effects of learning, of fatigue, of perception, and of the distance of movement upon the separate therbligs making up a motion.…”