Vine is not yet available for Android, but Google Play rates its 500px app as having a "high maturity" content rating, while Tumblr is marked as "low maturity".

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The lower average rating and longer maturity range of the Vanguard index give the fund a higher yield, risk and volatility.

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The Carnegie Mellon Software Engineering Institute in Pittsburgh, Pennsylvania, has a rating system for developers, called the Capability Maturity Model, that takes into account ability to produce quality software on time and on budget.

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