9 results for Alarcon, LF

  • Improving Planning Reliability and Project Performance using the Reliable Commitment Model.

    Gonzalez, Vicente; Alarcon, LF; Maturana, S; Mundaca, F; Bustamante, JA (2010)

    Journal article
    The University of Auckland Library

    Commitment planning reliability at an operational level is a key factor for improving project performance. In the last 15 years, the Last Planner System, a production planning and control system based on lean production principles, has improved commitment planning reliability in the construction industry. However, many construction decision makers continue to rely on their experience and intuition when planning their commitments, which hinders their reliability. The reliable commitment model (RCM) is proposed to improve commitment planning reliability at the operational level by using statistical models. RCM is an operational decision-making tool based on lean principles that supports short-term forecasting commitment planning using common-site information such as workers, buffers, and plans. RCM was tested in several case studies, demonstrating its production forecasting capabilities and its ability to help increase commitment planning reliability and improve project performance. RCM also supports workload and labor capacity matching decisions. RCM has the potential of becoming a useful production decision-making tool.

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  • Analysis of Factors Influencing Productivity Using Craftsmen Questionnaires: Case Study in a Chilean Construction Company

    Rivas, R; Borcherding, JD; Gonzalez, Vicente; Alarcon, LF (2011)

    Journal article
    The University of Auckland Library

    Improvement of productivity in construction has been a major industry challenge given its high impact on project results. It has received increased attention from construction researchers promoting different enhancement actions, being the analysis of factors affecting labor productivity an instrumental part in this process. This paper focuses on identifying and understanding the productivity factors affecting projects in a Chilean construction company, based on questionnaires administered to both direct workers and mid-level employees. Analysis of questionnaire results allowed for finding of organizational and managerial weaknesses, and also for comparison of findings against previous productivity studies. The results proved to be useful in coming up with recommendations for productivity improvements. The main findings indicate that the critical areas affecting construction productivity were related to Materials, Rework, Equipment and Truck availability, and Tools, as well as the workers motivational dynamics. These results are similar to those obtained in previous studies in the U.S. and in Chile. Salary expectations were found to be the main reason for turnover in the studied company, which was an aspect not mentioned in previous studies. Finally, additional analyses seem to show that some factors affecting productivity are common to construction projects across boundaries, therefore validating data aggregation and the possibility of learning from experiences in different locations and even separated in time of occurrence. Login or signup to follow this paper Followers (0)

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  • Selección de formas de relación con terceros en la construcción

    Palacios, JL; Gonzalez, Vicente; Alarcon, LF (2014-04)

    Journal article
    The University of Auckland Library

    Los proyectos de construcción se desarrollan bajo una alta y permanente interacción entre las partes involucradas. Esta interacción requiere que el uso de procesos colaborativos sea eficiente en la búsqueda del cumplimiento de los objetivos de los proyectos. Las tradicionales formas de relación han demostrado no ser muy eficaces para desarrollar proyectos exitosos, generando reacciones adversas entre las partes y afectando negativamente su desempeño. Esta investigación desarrollo una herramienta que permite mejorar las relaciones entre los involucrados en el desarrollo de proyectos de construccio´n. Este estudio tuvo un carácter exploratorio y descriptivo principalmente. En base a una detallada revisión bibliográfica en que se analizaron los principios de Partnering, Alliancing, Lean Project Delivery y Contratos Relacionales; y de entrevistas a expertos en administración de proyectos, se identificaron tres formas de relación con terceros que pueden emplearse para establecer relaciones contractuales: 1) Tradicional/Transaccional, que opera sobre la transferencia del riesgo; 2) Partnering/ Transaccional con Acuerdos, que promueve una relación win-win entre las partes apoyándose en la buena fe y acuerdos fuera del contrato original; y, 3) Alliancing/Relacional, que mediante un acuerdo formal busca alinear los objetivos e intereses de las partes en beneficio del proyecto. Estas formas de interacción relacional/contractual se implementaron en una matriz informal que permite apoyar la selección de las formas más adecuadas de interacción para un proyecto determinado. Así mismo, se discutieron las potenciales implicancias de una buena selección de las formas de relacio´n para mejorar el desempeño del proyecto y la relación entre las partes.

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  • Selection of Third Party Relationships in Construction

    Palacios, JL; Gonzalez, Vicente; Alarcon, LF (2013)

    Journal article
    The University of Auckland Library

    Construction projects involve intensive and constant interaction of the parties involved. This interaction requires an efficient use of collaborative processes focused on the fulfillment of the project´s objective. The traditional types of relationships have proven ineffective in developing successful projects, and they generate adverse relationships between the parties, negatively influencing performance. This research developed a tool that can improve the relationships between those involved in the course of a construction project. This research primarily involved an exploratory and descriptive approach. Based on an extensive literary review in which the principles of Partnering, Alliancing, Lean Project Delivery and Relational Contracts were analyzed, and interviews with project management experts, three types of relationships were identified that can be used to establish contractual relationships: 1) Traditional/Transactional, which operates on risk transference; 2) Partnering/Transactional with Agreements, that promotes a win-win relationship between parties, supported by good faith and agreements outside the original contract; and, 3) Alliancing/Relational which uses a formal agreement to align objectives and interests of the parties in mutual benefit for the project. These types of relational/contractual interactions are implemented in an informal matrix that supports the selection of the optimal type of interaction for a determined project. Also there is a discussion of the potential consequences of the correct selection of a relationship type so as to improve the project performance and the relationships of the parties involved.

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  • LEBSCO: Lean-Based Simulation Game for Construction Management Classrooms

    Gonzalez, Vicente; Orozco, F; Senior, B; Ingle, J; Forcael, E; Alarcon, LF (2015)

    Journal article
    The University of Auckland Library

    Simulations and classroom games are effective hands-on learning tools for construction management students and practitioners. This paper presents the background, methods and results of a new simulation management game called LEBSCO, which simulates aspects of the Last Planner System (LPS™) and Lean Production principles. LPS is central to the implementation of Lean Construction, an increasingly popular management approach based on the Toyota Production System and Lean Production. LPS requires continuous and collaborative effort from all stakeholders for the planning and control of a construction project, making it especially appropriate for the experiential learning allowed by simulation. LEBSCO consists of the assembly of Lego™ pieces to form a schematic house, and it is played by teams meeting in rounds simulating weeks of work. Each team is composed of stakeholders, such as a planner, resource suppliers and trade foremen, mirroring the planning and control process of a typical construction project. Participants build the Lego houses first using a Traditional management approach and then using Lean-based approach. A graduate course in construction management at The University of Auckland, New Zealand, is used as a case study to test the effectiveness of LEBSCO as a teaching method. The implementation results of LESBCO demonstrated its capability to transfer and disseminate Lean-based knowledge into construction.

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  • Site Management of Work-In-Process Buffers to Enhance Project Performance Using the Reliable Commitment Model: A Case Study

    Gonzalez, Vicente; Alarcon, LF; Maturana, S; Bustamante, A (2011-01-08)

    Journal article
    The University of Auckland Library

    Buffers have been commonly used as a production strategy to protect construction processes from the negative impact of variability. Construction practitioners and researchers have proposed several buffering approaches for different production situations and contexts. However, these solutions have been impractical for managing buffers. To overcome this, this study proposes a new site methodology for managing work-in-process (WIP) buffer in repetitive projects, on the basis of the reliable commitment model (RCM). RCM is a decision-making tool based on lean principles, which uses statistical models to develop more reliable work plans at the operational level. RCM helps to manage WIP buffer in work plans by using site information and planning reliability indicators that result in improved project performance, such as labor productivity and process progress. A repetitive building project was used as a case study. The main finding was that labor productivity, process progress, and waiting times improved when using larger WIP buffers than those typically used among crews. This shows the potential of RCM as a practical tool to manage WIP buffer sizes and to promote the use of lean production strategies at the operational level.

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  • Improving the Effectiveness of New Construction Management Philosophies using the Integral Theory

    Pavez, I; Gonzalez, Vicente; Alarcon, LF (2010-06-30)

    Journal article
    The University of Auckland Library

    Currently, most management approaches coming from engineering have been focused on the external world, it means, everything that can be seen (structures-processes-outcomes). This situation has created a low sustainability of these management approaches and tools, because they forget central aspects of people behavior both in individual and collective domains. Therefore, some efforts to integrate the organization’s inner and outer world have been carried out, with the aim of designing the organization’s inner world (personality-emotionality-values-culture) as a space that facilitate the incorporation of effective management practices focused on the external world, such as lean construction. This article describes and analyzes the revolutionary theory of integral vision proposed by Ken Wilber,as a framework that embraces different insights, theories and practices in such a manner that strengthen the discipline of project management under lean construction perspective. A production planning and control tool termed Last Planner System, which is based on lean construction principles, is used to illustrate the impact of integral vision over lean construction and project management. As a conclusion, it can be argued that, if lean construction wants to evolve towards an effective management practice, needs to include some elements of integral vision, in order to make compatible human and technical development inside the organization or project. By doing so, lean construction has to strength research areas related to people, which so far has received little attention.

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  • Investigating the Relationship between Planning Reliability and Project Performance

    Gonzalez, Vicente; Alarcon, LF; Mundaca, F (2008)

    Journal article
    The University of Auckland Library

    Variability is a well-known problem in construction projects, which leads to the general deterioration of project performance. During the last decade, the Last Planner System (LPS"), a production planning and control system based on lean production principles, has been increasingly applied in the construction industry to improve planning reliability reducing the negative impacts of variability. LPS" promotes actions to increase planning reliability, monitoring the percentage of plan completed (PPC) in a short-term period. However, there is limited research evidence about the relationship between planning reliability and project performance. In this paper, the authors report on a detailed research analysing this relationship during the construction phase of a home building project at activity and project levels. By doing so, two indexes are proposed: an activity planning reliability index called the process reliability index (PRI), and a project aggregate labour productivity index, called the project productivity index (PPI). Statistical analyses using the proposed indexes were conducted showing positive and strong relationships between planning reliability and performance at activity and project levels. Finally, the research findings provide the guidelines of a preliminary methodology to forecast the impacts of planning reliability over project performance, when lean production methodologies are applied in project planning and control.

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  • Multiobjective design of Work-In-Process buffer for scheduling repetitive building projects

    Gonzalez, Vicente; Alarcon, LF; Molenaar, K (2009)

    Journal article
    The University of Auckland Library

    Variability in production is one of the largest factors that negatively impacts construction project performance. A common construction practice to protect production systems from variability is the use of buffers (Bf). Construction practitioners and researchers have proposed buffering approaches for different production situations, but these approaches have faced practical limitations in their application. A multiobjective analytic model (MAM) is proposed to develop a graphical solution for the design of Work-In-Process (WIP) Bf in order to overcome these practical limitations to Bf application, being demonstrated through the scheduling of repetitive building projects. Multiobjective analytic modeling is based on Simulation–Optimization (SO) modeling and Pareto Fronts concepts. Simulation–Optimization framework uses Evolutionary Strategies (ES) as the optimization search approach, which allows for the design of optimum WIP Bf sizes by optimizing different project objectives (e.g., project cost, time and productivity). The framework is tested and validated on two repetitive building projects. The SO framework is then generalized through Pareto Front concepts, allowing for the development of the MAM as nomographs for practical use. The application advantages of the MAM are shown through a project scheduling example. Results demonstrate project performance improvements and a more efficient and practical design of WIP Bf. Additionally, production strategies based on WIP Bf and lean production principles in construction are discussed.

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