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Editorial

机译：社论

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Construction project managers tend to add a time buffer to task duration in the planning process, in order to compensate for variability in an uncertain work environment. While buffers are used widely in construction, the mechanism of time buffer allocation is unclear. Understanding why time buffers are added, and then quantifying the influence of different causes, is crucial for construction companies who want to take proactive steps towards strategically addressing the most important areas of interdependency and uncertainty, and reducing the associated time buffer in construction projects. Russell, Liu and Hsiang have developed and validated a conceptual model and associated causal structure used by project managers and field managers when buffering and planning for uncertainty. The authors first defined the key concepts used, then collected data using two main steps. The first involved exploratory interviews and research group discussions to identify 47 individual causes of time buffers. The second step was distributing a time buffer questionnaire to 175 companies across 37 states in the USA. Twelve underlying factors for time buffer allocation were identified for upper management and 14 factors were identified for field management. The authors then used structural equation modelling to develop models for field management based on both the frequency and severity response data collected. In order to validate the models, the authors collected a total of 63 completed surveys from construction field managers. Two final models (one for field managers and one for upper management) were proposed upon careful review of the survey results and participant feedback.
机译：建设项目经理倾向于在计划过程中为任务持续时间添加时间缓冲区，以补偿不确定工作环境中的可变性。尽管缓冲区在构造中被广泛使用，但是时间缓冲区分配的机制尚不清楚。对于想要采取积极措施从战略上解决相互依存和不确定性最重要领域并减少建筑项目中相关时间间隔的建筑公司而言，了解为什么要添加时间间隔，然后量化不同原因的影响至关重要。 Russell，Liu和Hsiang已经开发并验证了概念模型和相关的因果结构，供项目经理和现场经理在缓冲和规划不确定性时使用。作者首先定义了使用的关键概念，然后使用两个主要步骤来收集数据。第一次涉及探索性访谈和研究小组讨论，以找出造成时间缓冲的47个单独原因。第二步是向美国37个州的175家公司分发时间缓冲调查表。高层管理人员确定了十二个时间缓冲区分配的基本因素，而现场管理则确定了14个因素。然后，作者根据所收集的频率和严重性响应数据，使用结构方程模型来开发用于田间管理的模型。为了验证模型，作者从施工现场经理那里收集了总共63份完整的调查报告。在仔细审查调查结果和参与者反馈后，提出了两个最终模型（一个用于现场经理，一个用于高层管理人员）。

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