c6578b7d_ood_Shape_with_Webmaster_Tools__0
[1] Crawl Errors [2] Here we can see any crawl errors Google have discovered. These could be server errors, 404 pages, soft 404 pages, not followed pages etc... Have a look through each one and if necessary download the data to mine in Excel. Normally there is a pattern and simple fixes will make a big difference to these numbers. In an ideal world there would be no crawl errors at all but it is completely formal to have some 404 pages etc... if you can clean them up though, do. [0] 
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Keep Your Site in Good Shape with Webmaster Tools
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