Recently, it has became a major issue to redesign the matters agreed at community in public facilities that have been developed through citizen participation more than 10 years ago. The purpose of this paper is to clarify the subsequent change and refurbishment processes of two road projects which the author had involved, by comparing with the initial plans and to consider the issues at alteration and renovation of agreements. I showed that 1) it was necessary to reconsider to change / refurbishment matters forming agreement by citizen participation, 2) it was also necessary to clarify the realization and coping method in collaborative town development, 3) it was important to find significance in the process of forming agreement among the residents, and to establish a place for discussion by diverse stakeholders.

 The Nam Ngiep 1 Hydropower Project (NNP1) has been developed in Lao PDR and it took time, manpower and cost to solve an issue of resettlement of total 520 households and 3,500 project affected peoples (PAPs). They are indigenous ethnic minority “Hmong” and mostly selected the self-resettlement by getting cashing compensation than move to the resettlement village prepared by the project owner, though it has been developed to suit with their lifestyle by considering background such as custom, culture and history. This paper presents the study on factors such as land, war and gender of decision-making for resettlement related to NNP1, which were obtained through negotiations and activities with PAPs, interview with them and literature survey, and provide with measures to implement the resettlement of indigenous ethnic minority on hydropower development in Southeast Asia.

 The aging of infrastructure is a nationwide issue. It is important to establish a pavement maintenance cycle (inspection-diagnosis-action-record) in municipal roads, because municipal roads account for about 84.1% of the total length of service in Japan. Local governments have been conducting pavement inspections and making progress in pavement repairs based on the national pavement inspection guidelines, but budgets are currently tight. In this paper, the gap between the needs of local residents for pavement repair based on the “conventional pavement inspection” and the needs of pavement repair is shown for pavements managed by the Tamana City Office, and these issues are analyzed. Then, in order to reduce the cost of inspection, the direct pavement inspection using ICT is practiced, and based on the introduction effect and the improvement point of ICT, the multiplexing of the ICT use and the implementation of the efficient pavement inspection by direct management are described.

 In recent years, Japan is assisting techniques and capacity development of bridge maintenance and management for developing countries all over the world. And the activities of these projects aimed at formulation of maintenance and management plans, including bridge inspection and repair techniques, are being carried out. However, the current condition of the bridge to be managed is not understood and there is no effective data for the formulation of bridge maintenance plans when it is at the start of technical cooperation project because bridge inspection activities have not been carried out in many developing countries.

 To carry out efficient and effective bridge maintenance management, it is essential to consolidate bridge inventory data and inspection data. In this paper, the method of a bridge database development of about 2, 400 bridges nationwide managed by the Ministry of Public Works and Transport of Cambodia during the JICA technical cooperation project period will be described.

 In developing countries, the thoroughgoing inspection of the road network is difficult in not a few cases, but it is often possible to use information on attributes that would induce deterioration, such as the conditions of structures, usage, and the environment. In this study, the author proposes a methodology for space mapping, which estimates a mixed Markov deterioration model based on the results of inspection of road surface properties in some road spans and evaluates the deterioration rate distribution of the entire target region, by utilizing the statistical mapping model, which represents the relation between influence factors, which express the deterioration environment, and heterogeneity parameters of the deterioration model. With space mapping, it is possible to estimate the lifespans of road pavements throughout the target region, and support a variety of decision making for management. Lastly, the proposed space mapping method is applied to the evaluation of deterioration rates of simple pavements in Myanmar, and its effectiveness is analyzed.

 In the process of debate on the abolition of local railways, there are many cases in which citizens’ survival movements are developed, and in some railways whose survival has actually been decided, there are cases in which citizen organizations are thought to have played a major role. In this research, we focused on activities by a new type of civic organization that involves researchers, the media, local councilors, etc., which is different from the utilization promotion activities such as “Let’s get on and leave” for the Echizen Railway in Fukui Prefecture. Clarify the role they played in the consensus building process. Citizens’ organizations targeted in this study are not limited to the position of the general public, but also analyze and enlighten the evaluation of the public value of railways from an academic and scientific perspective, and consensus building activities involving the media and local councilors. In the past, it was not taken up as a research subject and did not remain in official records of the government.

 With the recent increase in the number of torrential rain disasters, the number of initial responses by local governments at the disaster site has been increasing, and it is important to improve the efficiency of these operations. On the other hand, technological innovation in ICT has made progress in the use of ICT in disaster management. However, it was difficult to secure a budget for disaster response at Tamana City Hall, which is short of financial resources. In Tamana City, where inefficient initial response has become apparent, we aimed to improve the operational efficiency of the initial response by substituting existing ICT, despite the lack of financial resources. After preliminary preparations through public-private collaboration, we expanded the use of ICT for the actual first response to the 2020 torrential rain disaster. The results of this study were analyzed by interviewing the front-line staff and analyzing the trends and reasons for the use of ICT.

 The Ministry of Land, Infrastructure, Transport and Tourism is promoting the Infrastructure System Overseas Deployment Action Plan 2019. However, it has been pointed out that the cost of construction in Japan is higher than that of competitors. In this study, in order to contribute to the reduction of construction costs for Japanese companies abroad, some examples of construction in China was taken up. China is developing a large number of infrastructure exports in developing countries. And some differences in design concepts between Japan and China was summarized. Specifically, it will be introduced the method for determining the bridge length based on the bridge length of 20m pitch adopted by the bridge constructed on National Highway No. 8 on Cambodia. And it will be introduced the method for reducing the cost by unifying the girder length used on National Highway No. 6. When designing bridge on the flood plain, it is necessary to devise ways to minimize erosion around the embankment and abutments / piers due to flooding. It will be shown that the design concept adopted by China is more rational in terms of cost and maintenance than the cost reduction method based on Japan's bridge minimization scenario.

 The reduction of non-revenue water (NRW) is an urgent means of conserving water resources and improving management, especially for urban areas of developing countries where population growth is rapid. This paper discusses the development of an NRW-reduction strategy in Conakry, Guinea. First, the approach to NRW measures as pursued in previous research was studied. Then, with reference to those results, an NRW strategy was formulated that related to the present context of water supply facilities in Conakry. Countermeasures to visible water leakage, improvement of metering efficiency, introduction of hydraulic zones, pressure management at each hydraulic zone, and implementation of these measures were prioritized. Procurement of flowmeters and the formulation of hydraulic zones were started to implement, and it is considered that the key to reducing NRW is continuing steady work related to the reduction of NRW, which will require both time and investment.

 It is important to understand the technical level of competing countries in promoting overseas development of infrastructure systems. For that purpose as well, it is necessary to investigate in advance whether or not there is a Japanese technology in the competing countries, application conditions such as extension of the performance and construction scale.

 Therefore, in this study, it will be investigated South Korea’s bridges in Vietnam, targeting South Korea, one of the competing countries for infrastructure exports. Then, it will be aimed to study the concept of design that may contribute to cost reduction in Japan. In addition, it will be also considered whether or not there is technology unique to South Korea, the difference between the Korean bridge design and the Japanese design concept, and whether or not there are maintenance considerations that lead to longer life.