Assessment of environmental and social impacts of development interventions at project level has been in practice for the last few decades in the world including Bangladesh using the tool known as Environmental Impact Assessment (EIA). EIA is a systematic step-by-step environmental assessment process to identify likely environmental and social impacts prior to implementation of a development project and finally proposes an environmental management plan (EMP). In Bangladesh, Environmental Conservation Rules (1997) and revised Environmental policy (2018) gave legal basis of using these tools. The government of Bangladesh is in the process of using three environmental instruments such as EIA, DIA (Disaster Impact Assessment) and SEA for three different purposes and applicable at three different scales. EIA is meant to be used for project-level impact assessments at the lowest tier; DIA is planned to be used at the sector level (e.g. agriculture, industry as sectors) and aims at assessing disaster and climate change impacts on the project and at the same time examine how the proposed project create conditions that may exacerbate existing disaster and climate change impact scenarios in project intervention areas. The SEA is the top-level decision-making instrument for examining environmental and social impacts of policies, programs and plans (PPPs). Applications of all these instruments need an in-depth understanding of physical, social, economic, ecological systems and functions. The experts of Science Connect have in-depth knowledge and experience in conducting all these exercise and offers a range of services in this connection.