The applied Indicator-based Sustainability Assessment Tool (InSAT) serves as a user-friendly computer-aided tool to support coastal and marine management. Focus is on sustainable coastal development, including environmental, social, and economic aspects. We apply the InSAT to assess the changes in sustainability before, during, and after the implementation of management measures. The assessments address three case studies in Lithuania: the construction of a liquefied natural gas terminal in Klaipeda, the renewal of the port of Sventoji, and the opening of a beach in Nida. The application of core and optional indicators highlights the strengths and weaknesses of the management measures. We analyze to what extent, how, and when the InSAT can be applied within a stepwise Systems Approach Framework (SAF) to support sustainable coastal and marine management. Further, we assess how the tool can be applied within other integrated approaches. The application of tailor-made indicators helps to identify potential conflicts and raise discussions about sustainable development between stakeholders and decision-makers and therefore supports the decision-making process. The tool indicates the management measures’ weaknesses, but the assessment results do not indicate what kind of solutions should be undertaken. However, it can still serve to support, guide, and supplement the participation and discussion processes.
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