The current state budget allocated for Indonesian government projects has exceeded 10% for infrastructure development. This large budget indicates a need for the construction industry to implement more professional management practices for better cost, time, quality, safety, and environmental impact. Lean construction is used to increase productivity and reduce waste in a project. Therefore, this study aimed to extend lean construction principles to the planning and execution phases of DB projects, where these two entities are integrated into the main contractor. Quantitative and qualitative study methods were used to analyze secondary data from six DB project sites and conduct focus group discussions (FGDs) with expert panels using the Delphi method for consensus. The results showed the factors and variables that influence the implementation of lean construction in government projects in Indonesia.

Procurement is the process of obtaining goods and services in a construction project and is a crucial point for the success of a design and build (DB) project. The success of a DB project has an effect on work performance metrics such as cost, quality, and time. Therefore, this research aims to develop a readiness model for implementing sustainable procurement in a DB project with a financing system in the state/regional budget (APBN/APBD). By using previous literature reviews, this research adopted a mixture of qualitative and quantitative methods. Specifically, the qualitative method was conducted using in-depth interviews, and conclusions were drawn using the Delphi method and focus group discussion (FGD). Meanwhile, the quantitative method was used to analyze secondary data from the current DB project in order to examine sustainable procurement. The projects examined were spread across the country and had a value of at least 100 billion. Consequently, the results showed that various factors influenced sustainable procurement in the DB management project. In addition, this research impacted better procurement management in the DB project based on APBN/APBD funding, thereby increasing project productivity and innovation, as well as other beneficial values to stakeholders. Typically, the result could be used as a readiness model for implementing sustainable procurement in a DB project with APBN/APBD funding schemes, serving as a guide for construction management in the future and being useful for decision making on government projects.

The implementation of lean construction is very important in the construction industry to reduce waste and increase productivity. To ensure its effective implementation, clear and measurable Key Performance Indicators (KPIs) are necessary. Therefore, this research aimed to develop SMART-based KPIs (Specific, Measurable, Attainable, Realistic, and Time-bound) for lean construction implementation, which measure indicators throughout the project life cycle. In this context, both qualitative and quantitative methods were used to collect data. Quantitative data were collected through surveys, assessing the perceptions of respondents concerning KPIs that had been developed. Meanwhile, qualitative data were collected through interviews and expert Focus Group Discussions (FGDs), which included in-depth analysis and conclusions regarding lean construction KPIs. The results produced were KPIs that could be used to measure effectiveness in implementing lean construction, particularly for building projects in Indonesia. Consequently, this research provided new views concerning effective lean construction, which could be explored in more depth and implemented for stakeholders in the construction industry. This development could eventually improve project performance by reducing waste and increasing productivity in construction projects.

The value of construction projects in Indonesia is significantly enhanced by partnering, leading to the adoption of the model by the government. The Indonesian government, through the Ministry of Finance, is developing the partnering model based on Public–Private Partnerships (PPPs) projects to further accelerate extensive infrastructure development. By leveraging PPPs, these projects intend to bridge the funding gap experienced by the government to facilitate swift infrastructure development and enhance the value of construction projects even further. Therefore, this study aimed to examine PPPs, such as the solicited projects occurring in Indonesia. Solicited projects were government-initiated PPPs based on long-term development plans. A qualitative method was adopted, conducting in-depth analyses at three locations with solicited PPP projects. Using Soft System Methodology (SSM) and expert Focus Group Discussion (FGD) through the Delphi method, this study investigated the interactions and depth of partnering in PPP projects. The obtained results emphasized the positive impact of solicited projects on Indonesian infrastructure development, addressing the funding gap experienced by the government. This study further contributed new insights for stakeholders and academics in the development of the projects in Indonesia, emphasizing the necessity of extensive development to support the implementation.

The construction industry is naturally complex and constantly changing, with various factors impacting project results. Among the different methods developed to navigate this complexity, partnering is believed to increase project value and performance. Therefore, this research aimed at analyzing and formulating elements as well as indicators at each phase of a partnership-based project life cycle, serving as tools and techniques for measuring the depth of partnering in construction projects. The methodology used included both qualitative and quantitative methods (mixed method). In the qualitative method, the literature from relevant journals, books, and previous research was reviewed. This process was followed by an expert assessment through a Focus Group Discussion (FGD) to define elements and indicators for measuring the depth of partnering in construction projects. Meanwhile, the quantitative method comprised analyzing secondary project data to compare projects with in-depth partnering in order to deliver better value. The result of this research was the development of Key Performance Indicators (KPIs) to measure maturity partnering in partnership-based projects. Typically, the tools were adjusted to different phases of the project life cycle, starting from project initiation, comprising all stakeholders. Consequently, the outcome of this research could be used by organizations in the construction industry to develop partnering in partnership projects in Indonesia.

Design and procurement integration strategies in construction projects play an important role and have an impact on the overall project cycle. Integrated design and procurement will increase productivity and reduce waste. This research aims to provide a guide to good design and procurement integration strategies in Design and Build (DB) projects in government projects. This research uses qualitative and quantitative methods in the form of a schematic literature review followed by a Focus Group Discussion (FGD) with the Delphi method to formulate integrated design and procurement that improve project performance. In-depth interviews were conducted with 90 respondents to explore the implementation of the design and procurement strategy on the project used as a case study. The results of this research are recommendations for an integrated design and procurement strategy which can be used as a Standard Operating Procedure (SOP) in DB projects on government projects so that it can provide added value from the start of the project being designed through tenders. This research can be utilized by project stakeholders, academics and anyone who will develop project performance through the integrated design and procurement in the long term.