There are truly objective metrics out there now, which take into account the contextual difference every developer works in, that analyse revisions from multiple dimensions such as it's Volume, Complexity and Interrelatedness altogether.
As Jilles said, it's true that gut feelings and opinions are part of the process with other metrics but now there are measures that eliminate that altogether. It's possible to directly compare productivity (one metric) and maintainability (another metric from a quality perspective) of code provided by a developer, which starts to make comparison of developer effort on every project fair and allows everyone to move forward together to improve the rate at which code is delivered and simultaneously advance it.
They're useful as they give you an indication of where to look, especially if you're going to be working on different projects with many teams wouldn't you say?
Anyway the metrics I was talking about earlier and I've come across so far is provided by BlueOptima (blueoptima.com).
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There are truly objective metrics out there now, which take into account the contextual difference every developer works in, that analyse revisions from multiple dimensions such as it's Volume, Complexity and Interrelatedness altogether.
As Jilles said, it's true that gut feelings and opinions are part of the process with other metrics but now there are measures that eliminate that altogether. It's possible to directly compare productivity (one metric) and maintainability (another metric from a quality perspective) of code provided by a developer, which starts to make comparison of developer effort on every project fair and allows everyone to move forward together to improve the rate at which code is delivered and simultaneously advance it.
They're useful as they give you an indication of where to look, especially if you're going to be working on different projects with many teams wouldn't you say?
Anyway the metrics I was talking about earlier and I've come across so far is provided by BlueOptima (blueoptima.com).