Stakeholder management has an important role in the success of the project because the strategies, plans, methods, and processes for stakeholders greatly determine the success of sustainable construction implementation. Lean construction is one of the principles in implementing sustainable construction by maximizing value and minimizing waste to increase productivity. This study aims to analyze the stakeholder engagement assessment matrix in lean construction, analyze the drivers and barriers in lean construction, and develop stakeholder engagement strategies to improve the implementation of sustainable lean construction. For this study, a questionnaire survey with 61 respondents was used. The data analysis method uses the Certainty Index, RII, Fuzzy AHP, and Fuzzy-TOPSIS. The findings of this research show that there are engagement gaps among stakeholders such as owners, contractors, consultants, subcontractors, architects, the government, local governments, and NGOs. There is no engagement gap between project suppliers and investors. The highest barrier to implementing sustainable lean construction is a lack of knowledge and skills in using lean tools and principles, while the highest driver to implement sustainable lean construction is improved time efficiency and process standardization. The best strategy for increasing stakeholder engagement is by having governments develop regulations and standardize green and sustainable materials.

With increasing sustainability concerns, such as the construction sector being responsible for using 42% of the world’s energy, 30% of its raw materials, and 25% of its fresh water, building projects have been encouraged to adopt green and sustainable construction strategies. Innovation in science and technology plays an important role to support the transition to sustainable development. Its ability to rely on advanced technology and effective construction processes makes Building Information Modelling (BIM) an opportunity that can bring great benefits to the sustainable construction sector. This research focuses on functions, barriers, drivers, and implementation strategies, which were analyzed for their relationship with sustainable construction criteria using structural equation modelling (SEM). It was found that the BIM function has a positive influence on sustainable construction with relevant indicators in the form of building digitization, improvement from 2D CAD methods, and integration between tools. Relevant barriers consist of lack of demand from clients and implementation that feels like additional work. Relevant drivers consist of increasing work productivity and reducing work errors. Meanwhile, relevant strategies consist of conducting further research, providing commitment, and setting up infrastructure for the application of BIM into sustainable construction.

The electricity supply in Indonesia is considered inefficient, as indicated by the increase in the Cost of Generation Provision (CGP) in the 2016–2021 period. Indications of high supply chain risks are not commensurate with the low demand for LNG. Nevertheless, every power plant on small islands must be served by minimizing costs. This study aims to develop a risk-based small-scale supply chain model to distribute LNG in archipelagic areas by minimizing infrastructure costs, including investment and operations. This paper formulates a risk-based small-scale LNG (SS-LNG) model with milk runs, which are rarely applied in LNG supply chains, thus impacting cost efficiency and the sustainability of LNG supply in Indonesia. The simulation was carried out using the vehicle routing problem with milk run (VRPMR) method. The optimization results show that the 2-vessel scheme is an optimal and efficient risk-based SS-LNG supply chain model. However, it appears that changing the scheme from 1 to 2 vessels generally increases the infrastructure tariff by 3%, or USD 0.11 per MMBTU. This risk-based supply chain model is able to ensure a fuel cost efficiency of 27% for power plants.

DKI Jakarta is an urban area with a high population density during working hours, reached 219 people/ha in 2017. This population density encouraged change in green open space to be roads and high-rise buildings, as well as increased exhaust emissions from motorized vehicles. As a result, urban heat island phenomenon has emerged in several locations such as the Jagorawi Toll Road, Cempaka Putih, and Kemayoran. Efforts have been made to reduce and mitigate these impacts by implementing vertical greening system at the flyover structure in DKI Jakarta. However, the temperature in DKI Jakarta continued to rise reaching >41˚C in 2019 as the highest record. The continuous increase in temperature proved that the implementation has not been maximized. This study was conducted for the purpose of identifying the benefits and challenges of the application of vertical greening system at the flyover structure and analyzed existing condition of the implemented vertical greening system at the flyover structure in DKI Jakarta. The method used to achieve those purposes was survey by questionnaire and interview, conducted to the provincial government of DKI Jakarta and vertical greening system contractors. The results of this study pointed that the government and contractors most agree on the aesthetic benefits from the social aspect and the challenges of the initial investment from the cost aspect. The implementation of a vertical greening system at the flyover structure has been carried out in 14 different locations with the majority of the systems implemented were living walls.