Abstract: In performing software maintenance tasks,developers often need to find and understand program elements (e.g．classes or methods) that are relevant to a given feature (called feature location or concept location)．Some empirical studies have shown that feature location is a human-centric and information-intensive process with interactive exploration,feedback and strategy adjustment．Based on this idea,we proposed a multi-faceted and interactive features localization approach,and developed a Web-based supporting tool MFIE (Multi-Faceted Interactive Explorer)．This paper introduced the features localization approach supported by MFIE,its multi-faceted interface design and other characteristics．Furthermore,the paper also described the usage of MFIE with a use case of feature location.

Key words: Feature location,Multi-facet,Interactive,Web-based,Tool