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The growing diffusion of Web-based services in manyand different business domains has triggered the need fornew Web Applications (WAs). The pressing marketdemand imposes very short time for the development ofnew WAs, and frequent modifications for existing ones.Well-defined software processes and methodologies arerarely adopted both in the development and maintenancephases. As a consequence, WAs' quality usually degradesin terms of architecture, documentation, andmaintainability. Major concerns regard the difficulties inestimating costs of maintenance interventions.Thus, a strong need for methods and models to assessthe maintainability of existing WAs is growing more andmore. In this paper we introduce a first proposal for a WAmaintainability model; the model considers thosepeculiarities that makes a WA different from a traditionalsoftware system and a set of metrics allowing an estimateof the maintainability is identified. Results from someinitial case studies to verify the effectiveness of theproposed model are presented in the paper.