Im asking myself if there is a way to say when google will next time evaluate a website. I dont speak of PR but instead of the ranking for keywords. You can look when the google cache is updated. And I have read the more google is trusting a site the more often it will crawl the site. So looking at the crawlrate will give a good value how much google is trusting that domain. But it seems to me that google doesnt update the serp-rankings only at that moments. I mean most of the time the positions are sinking or raising a bit. I think the reason is that google determines other websites new and if they rank before the own website your ranking sinks. But sometimes google is reevaluating the serpposition for the own website. Is there a way to determine when this will happen? It would be useful for seeing when changes in seo will be judged.