DOI 10.5281/zenodo.6911711 935 | V17.I07 INTERDEPENDENT PUBLIC INFRASTRUCTURES OPERATION AND MAINTENANCE COORDINATION: A SOFT SYSTEM BASED CONCEPTUAL MODEL IPAK NENENG MARDIAH BUKIT 1* , PUTI FARIDA MARZUKI 2 , RIZAL ZAINUDDIN TAMIN 2 and IWAN INRAWAN WIRATMADJA 3 1 Doctoral Program, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, Indonesia. 2 Construction Engineering and Management Research Program, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, Indonesia. 3 Industrial Engineering Department, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, Indonesia. *Corresponding author ipbukit@gmail.com Abstract The existing road network in Indonesia is a public infrastructure system containing utility facilities, such as electricity, telecommunication, and water supply infrastructures in and adjacent to the public right of way. These public infrastructures are integrated and interdependent, meaning that these roads and facilities’ operation and maintenance activities affect one another. These activities, when uncoordinated, can have a negative impact on or cause damage of the road and the facilities. However, the interaction is still unstructured and poorly defined because each stakeholder has a different assessment, business, schedule, technique, organization structure, and regulation. A qualitative approach has been conducted to collect information about problem situations in the public right of way in five cities and two districts in Indonesia. This paper aims to develop an interdependent public infrastructures operation and maintenance coordination conceptual model in the existing road system using the Soft System Methodology (SSM). SSM is currently the effective way to understand the problem situation of an unstructured system. This method provides a conceptual coordination model in a constructive manner that can help the authority to improve the problem situation. Keywords: Conceptual model; Coordination; Interdependent Public Infrastructure; Soft System Methodology. 1. Introduction The advancement of human civilization, the quality of life of the nation, and the economic strength of a country are reflected in its ownership of public infrastructures (Uddin et al., 2013). Therefore, the government provides and will ensure the sustainability and availability of public infrastructure for its community. However, public infrastructure damage threats potentially appear from various sources, among others, from the presence of other infrastructure and their interactions that occur at the operation and maintenance stage. Several infrastructures in one area are interconnected and interact with each other in several combinations of interactions such as physical, geographic, information systems, and logical interdependencies (Saidi et al., 2018). The operation and maintenance activities of existing roads in most of the cities in Indonesia interact with those of utility facilities such as clean water, electricity, and communication situated underground along the public right of way. All of these infrastructures will be interrelated and connected to each other in an integrated manner, and that is why they