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 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.