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Age
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More than 3 years
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Stability
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Stabilized software. Releases provide mainly new functionalities, even if bug fixes are also provided
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History, known problems
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No known major problem or crisis
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Popularity (at its scale)
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Very few users identified
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References
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Often implemented for critical applications
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Contributing community
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No community or without real activity (forum, mailing lists…)
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Books
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No book about the software
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Developers identification and turnover
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Less than 3 developers, not clearly identified
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Activity on bugs
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Detectable activity but without process clearly exposed, long reaction/resolution time
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Activity on releases
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Activity on production and development releases. Frequent minor releases (bug fixes)
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Independence of developments
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Developments realized at 100% by employees of a single company
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