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BALLARD, Glenn. Shielding production from uncertainty: first step in an improvement strategy. In: SEMINÁRIO INTERNACIONAL LEAN CONSTRUCTION, 1996. São Paulo. Anais… São Paulo, 1996. p.01-16.
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Abstract

Production units such as construction crews and engineering squads execute work based upon assignments. The quality of those assignments is a key factor determining production unit productivity. Research has revealed that the quality of assignments can be substantially improved by selecting those assignments against soundness, sequence, and size criteria, and by managing near-term work flow to create and maintain a buffer of quality assignments available for selection. Making quality assignments effectively shields production units from work flow uncertainty and variation, enabling them to improve their own productivity, and also to improve the productivity of their downstream customers. The associated reduction in task duration can shorten projects. Further reduction of project duration comes from reducing the buffers previously needed to accomodate flow variation.
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