I came across this comment by Tim Post today in a separate question:
The only thing holding [Code Review] back from graduating is the lack of high rep users - there just aren't enough 1k+, 3k+ users on the site, and it can't quite yet sustain an election. Every single thing about CR is ready but that - it's really just a matter of time at this point (and, well, voting).
Almost all the posts about what the criteria for graduation are vague and don't mention specific examples:
- What are the success criteria for an Area 51 beta site?
- Are there any clear and objective criteria when the public beta site will graduate?
The first question specifically asks about 2 beta (now graduated) sites, but the answer is more general, "Look at this blog" with general guidance.
How often are site stats reviewed by the team in charge of betas? And is it appropriate to create meta questions asking where a site stands to get feedback to the community on how to improve?