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A health risk assessment (HRA) system is an important tool for helping people realize what lifestyle changes they should have in order to live a healthier and longer life, and what benefits they can have by doing the right things. In this thesis, we discuss the design and implementation of various components of the web-based version of a health risk assessment system, called the HealthyLifeHRA system, which is being developed by a multi-institutional team of researchers.The HealthyLifeHRA system allows a user to take a questionnaire, and produces a visualized report with statistics, messages, pictures, and bar charts about the user’s health status, that highlights potential mortality risks of the participant. Questions in the questionnaire include basic demographic information, epidemiologic data, and life-style information. This tool can be used by health care providers to communicate with patients on their health status. And individual users can use it to10become aware of their health situation, and, perhaps, take early measures to deal with various higher-level mortality risks in their lifestyles.The HealthyLifeHRA family consists of a website version, a standalone version, an iPad version and an Android tablet version. Web-based version of the HealthyLifeHRA family takes advantage of various computing and web technologies, and provides multiple HRA client systems for use in primary care clinical settings. The web-based version includes a client-side interface library, a client-side report generation library and a server-side risk computation engine.