The objective of this paper is to investigate the integrated design approach implemented in the early design phases and identify how it informed the design process of the Net-Zero Energy Building (NZEB) case study. The four components studied were the stakeholders, processes, technology, and phases of assessment. A series of semi-structured, open ended interviews were conducted with the key decision makers and decision facilitators to identify their role in the early design process, the design approach adopted, rationale for decision-making, types of evaluations performed, and tools used for analysis. Through this process, the key phases of decision-making were identified that resulted in understanding of the path to achieving Net-Zero Energy (NZE) design goal and performance outcome. The inter-relationship between the project objectives, decision context, occupants usage patterns, strategies and integrated systems, building operation and renewable energy production was identified through a series of knowledge maps and visual process models leading to the identification of the key performance indicators.
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