PRESCRIBED MOTIONS AFFORD RHYTHM AND AESTHETIC PLEASURE.--The prescribed motions that result from motion study and time study, and that are arranged in cycles, afford a rhythm that allows the attention to "glide over some beats and linger on others," as Prof. Stratton describes it, in a different connection.[28] So also the "perfectly controlled" movements, which fall under the direction of a guiding law, and which "obey the will absolutely,"[29] give an aesthetic pleasure and afford less of a tax upon the attention. INSTRUCTION CARD CREATES AND HOLDS ATTENTION.--As has been already said in describing the instruction card under Standardization, it was designed as a result of investigations as to what would best secure output,--to attract and hold the attention.[30] Providing, as it does, all directions that an experienced worker is likely to need, he can confine his attention solely to his work and his card; usually, after the card is once studied, to his work alone. The close relation of the elements of the instruction card affords a field for attention to lapse, and be recalled in the new elements that are constantly made apparent. ORAL INDIVIDUAL TEACHING FOSTERS CONCENTRATED ATTENTION.--The fact that under Scientific Management oral teaching is individual, not only directly concentrates the attention of the learner upon what he is being taught, but also indirectly prevents distraction from fear of ridicule of others over the question, or embarrassment in talking before a crowd. THE BULLETIN BOARD FURNISHES THE ELEMENT OF CHANGE.--In order that interest or attention may be held, there must be provision for allied subjects on which the mind is to wander. This, under Scientific Management, is constantly furnished by the collection of jobs ahead on the bulletin board. The tasks piled up ahead upon this bulletin board provide a needed and ready change for the subject of attention or interest, which conserves the economic value of concentrated attention of the worker upon his work. Such future tasks furnish sufficient range of subject for wandering attention to rest the mind from the wearying effect of overconcentration or forced attention. The assigned task of the future systematizes the "stream of attention," and an orderly scheme of habits of thought is installed. When the scheme is an orderly shifting of attention, the mind is doing its best work, for, while the standardized extreme subdivision of Taylor's plan, the comparison of the ultimate unit, and groupings of units of future tasks are often helps in achieving the present tasks, without such a definite orderly scheme for shifting the attention and interest, the attention will shift to useless subjects, and the result will be scattered. INCENTIVES MAINTAIN INTEREST.--The knowledge that a prompt reward will follow success stimulates interest. The knowledge that this reward is sure concentrates attention and thus maintains interest.