Purpose: To review the state -of-the-art of Lean Project Delivery (LPD), to show the relationship between LPD and integrated design and delivery (particularly the IDDS element âcollaborative processes â) and to propose further stages of development, research and practice. Method: Description and analysis of action research & learning in current practice. Findings: In the context of Lean Project Delivery with Target Value Design (TVD) projects are completed below market cost âso far as much as 19% below and expected cost falls as design and construction progresses. Limitations: this work is based on a limited number of linked cases in the US over the last 10 years. We suggest the ideas are applicable far more widely. Implications: there is still more development and research required to develop effective leadership models for integrated design and delivery, create whole of life Target Value Design, to create signifi cant bodies of evidence to guide the design of many building types and to further develop the Lean Project Delivery System. Value for practitioners: initial indications are that the methods described work together to deliver signifi cant benefi ts for owners/clients/end -users and create a more satisfying experience for most designers and constructors.
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