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The paper presents concepts of a development environment for Internet-based applications of smart sensors. It reviews an integrated, sensor-networking framework stemming from the IEEE 1451.1 object-based networking model, complemented by the Internet Protocol multicast that mediates efficient and unified access from Internet to smart sensors. The kernel of the paper deals with tools and techniques aiming to prop specification and design life cycle phases of applications development. A pressure measurement analyzer, which is a pilot application developed concurrently with design tools and techniques, serves as a case study demonstrating the design approach.