Shielding Production: Essential Step in Production Control

Ballard, Glenn; Howell, Gregory A.

doi:10.1061/(asce)0733-9364(1998)124:1(11)

Cited by 314 publications

(204 citation statements)

References 2 publications

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“…The starting point for the development of the LPS was the observation that typically only half of the tasks in a weekly plan get realized as planned on site (Ballard & Howell 1998). By thus placing the unpredictability of the construction process at the centre of the analysis, the LPS addresses the need to recognise continually changing context thorough the short term planning and control of operations.…”

Section: Discussionmentioning

confidence: 99%

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Producing things or production flows? Ontological assumptions in the thinking of managers and professionals in construction

Rooke

Koskela

Seymour³

2007

Construction Management and Economics

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New approaches to production management can be conceptualized as treating production as flow rather than transformation. These alternatives can in turn be regarded as reflecting opposing ontological positions, holding respectively that reality is constituted of temporal process, or atemporal substance. The new production philosophy thus arguably represents a process ontology radically different from the atemporal metaphysics underlying conventional methods and theories. Moreover, research in physics education has identified the disjunction between ontological categories of 'substance' and 'process' as a particularly acute barrier to understanding process phenomena. Studies are presented which demonstrate the possibility of specifying and classifying mental models, with regard to two important management solutions in construction. Thus, procedures typically adopted in Quantity Surveying and the implementation of Structural Engineering Design are examined. Methods of measurement used in Quantity Surveying are designed to account primarily for physical, rather than temporal properties. In design, the emphasis is on representing properties of finished structures, rather than the construction processes. The process is then managed by treating the design and its Things or Flows? Rooke, Koskela, Seymour 2007 1 execution as separate products. It is argued here that alternative, more effective management solutions are derived from a process ontology.

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Section: Discussionmentioning

confidence: 99%

“…The Last Planner TM system 1 (LPS) of production control (Ballard & Howell 1998;Ballard 2000) is 1 The trademarking of the LPS is intended to prevent abuse of the system and not to restrict its use. The Lean Things or Flows?…”

Section: The Significance Of Ontological Categoriesmentioning

confidence: 99%

Producing things or production flows? Ontological assumptions in the thinking of managers and professionals in construction

Rooke

Koskela

Seymour³

2007

Construction Management and Economics

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“…The application of flow theory in the built environment has led to useful developments such as the Last Planner (Ballard and Howell, 1998;Ballard, 2000) and the ADePT tool (Austin et al,8/26 1994). However, notwithstanding the successful application of both these approaches (Thomassen et al, 2003;Baldwin et al, 2008) they do not represent the application of either sophisticated mathematics or modelling techniques.…”

Section: /26mentioning

confidence: 99%

Models and metaphors: complexity theory and through-life management in the built environment

Rooke

Molloy

Sinclair

et al. 2008

Architectural Engineering and Design Management

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Complexity thinking may have both modelling and metaphorical applications in the through-life management of the built environment. These two distinct approaches are examined and compared. In the first instance, some of the sources of complexity in the design, construction and maintenance of the built environment are identified. The metaphorical use of complexity in management thinking and its application in the built environment are briefly examined. This is followed by an exploration of modelling techniques relevant to built environment concerns. Non-linear and complex mathematical techniques such as fuzzy logic, cellular automata and attractors, may be applicable to their analysis.Existing software tools are identified and examples of successful built environment applications of complexity modelling are given. Some issues that arise include the definition of phenomena in a mathematically usable way, the functionality of available software and the possibility of going beyond representational modelling. Further questions arising from the application of complexity thinking are discussed, including the possibilities for confusion that arise from the use of metaphor.The metaphor of a 'commentary machine' is suggested as a possible way forward and it is suggested 1/26 Models and Metaphors 2008 Rooke, Molloy, Sinclair, Koskela, Siriwardena, Kagioglou, Siemieniuch that an appropriate linguistic analysis can in certain situations reduce perceived complexity.

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“…If the assignments are not completed as planned, they must detail the reasons for variance. This data is used to calculate Percent of Plan Completed (PPC) (Ballard and Howell, 1998) to measure the reliability of the planning system.…”

Section: Extended Workplan Software Developmentmentioning

confidence: 99%