Silo structure have been hot topic quite a while already and I have implemented some sort of silo structure to all my sites. One thing I was wondering is that how strict you should be when building silo structure? Lets say you have 4 keywords that you are mainly targeting, and which are most competitive. You setup your website in a way, that homepage works mostly as directory, then you have 4 pages for those keywords you are targeting and 4 supporting categories for those keywords. Would it make sense to 'break' the structure if you publish 1 post in each category which are closely related, should those be linked together anyway. For example you publish post like these: Cheap Keyword1 - in Category Keyword1's Cheap Keyword2 - in Category Keyword2's Cheap Keyword3 - in Category Keyword3's Cheap Keyword4 - in Category Keyword4's Linking these together would break the actual silo structure, but at least in human point of view these posts are related enough. Should we still keep the silo for the sake of google spiders, or should we just link these categories together and break the flow? Anyone experienced with 100% strict silo structures? If so, what kind of results you had? Also, does it make sense to keep category pages indexed? I've seen mixed opinion about this and would love to hear comments on that.