This paper describes the influence of job characteristics, rewards, relations with superiors, relations with coworkers, and fulfillment of higher order needs, as job facets, on the job satisfaction of workers in Indonesian construction companies. A questionnaire survey was conducted in Jakarta (the capital city) and Bandung (one of Indonesia's major cities). The results revealed that workers in different occupational groups and managerial positions perceive differently the conditions of job facets and that there are different levels of job satisfaction among different categories of workers. This research indicates that workers care about the quality of their work and company's performance and that these aspects affect significantly their job satisfaction. Reward is also revealed to have an important influence on workers' job satisfaction.

Change orders are among the main sources of problems challenging timely completion of construction projects. The significantly needed conducive interaction among project participants to mitigate completion delay risk due to change orders is often hampered by interface problems. This article describes potential sources of interface problems and their role in affecting completion time of change order-challenged infrastructure construction projects in Indonesia. The identified sources then serve as inputs to formulate a systems thinking model of relational interface problems in change order-challenged projects. A survey of eleven important infrastructure construction projects was conducted to obtain data on the main sources of these interface problems and their severity indexes. A second survey was later conducted to perceive the most frequent causes of change orders, the influence of interface problem cause factors on the length of change order process and the influence of interface problem cause factors on the expediting capacity of a project team and ultimately induce a delay of project completion. The results of both surveys then served as inputs to a systems thinking structure showing the factors in a change order-challenged project. The study shows that contract, technical experience, management, coordination and financial aspects are the potential sources of interface problems in Indonesian infrastructure construction projects. In a change order-challenged project, these interface problems' sources will complicate the efforts to achieve the project's time objective. The study especially points out the role of contract documents' quality in increasing the likelihood and extent of change orders and the influence of workers' productivity in mitigating the negative impact of a change order.

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& Built Environment (SIBE) under the same authors. In-depth analysis and discussion have been provided to have more elaborate perspective and conclusion.