How does Google generates Sitelinks

Google Doesn't Say How to Get Sitelinks 
The workings of many Google algorithms, including Sitelinks, are kept secret to discourage people from manipulating the rankings, but we can still look at examples and try to understand where Sitelinks come from. I've worked on a number of sites with Sitelinks, and these sites are similar in the following ways: 

Site ranks first for the keyword(s) that generate the Sitelinks listing 
Easily spiderable, structured navigation 
Fairly high natural search traffic 
High click through rates from the search results page 
Useful outbound links 
Inbound links from high quality sites 
Site age is several years or older 
These factors may, or may not, be exactly what Google uses to trigger Sitelinks. Nevertheless, everything on this list is desirable for a web marketing program, so using the list to guide our strategy will probably help our sites become more effective in any case.

Google generates Sitelinks

The number of indexed pages for the keyword you are targeting is also important. Please keep in mind that I am not discussing about the number of indexed pages for your website, but for the number of results shown in Google for that particular keyword. 
The age of the website is definitely an aspect when deciding how and when Sitelinks appear. As far as my tests go, and using a naturally and organically built website (no extensive or forced SEO), you can NOT have Sitelinks if the website is younger than 18-24 months, varying from case to case. 
You have to rank #1 for that particular keyword (and the ranking has to be stable) to be able to have any Sitelinks at all. This is very important and it has been proven true in 100% of times.

The links shown below some sites in our search results, called sitelinks, are meant to help users navigate your site. Our systems analyze the link structure of your site to find shortcuts that will save users time and allow them to quickly find the information they're looking for. 

We only show sitelinks for results when we think they'll be useful to the user. If the structure of your site doesn't allow our algorithms to find good sitelinks, or we don't think that the sitelinks for your site are relevant for the user's query, we won't show them.
At the moment, sitelinks are completely automated. We're always working to improve our sitelinks algorithms, and we may incorporate webmaster input in the future.
If you think that the sitelinks displayed for your site are inappropriate or incorrect, you can block them so that they no longer appear. 


To block a sitelink, first ensure that you have verified ownership of the site. Then:
On the Webmaster Tools Dashboard, click the site you want. 
Under Links, click Sitelinks. If we have sitelinks information for your site, we'll display a list of sitelinks. 
Click Block next to the sitelink you want to remove. Please let us know why you want to block the sitelink - it will help us improve the way we generate and display sitelinks.
Once you've blocked or unblocked a sitelink, it can take some time for your changes to be visible.
Note that we only display sitelinks when a site has a minimum of three sitelinks available. If you have two or fewer unblocked sitelinks, no sitelinks at all will appear in Google search results for your site.
Once you've blocked a sitelink, it won't appear in the Google search results for 90 days. This period will be extended every time you visit the Sitelinks page on Webmaster Tools. 
Whilst many other specialists and/or bloggers from the industry around the Internet have tried to help you figure out some ways to get Sitelinks, I will try to contradict them because some of those advices might not have a contribution to your effort, mainly because they are just too general and my experience says that they could be just loose-ends. Some of these advices might be:

Making your website W3C valid. This is not a bad thing, but I highly doubt that it will make your website more prone to get Sitelinks. A lot of people have reported building their website with erratic code from 1992, and still having Sitelinks. 
Having links from powerful websites. I doubt that this aspect will help you in getting Sitelinks at all. Have a look at how I see inbound links having an effect, above (in the Procedures section). 
Having a lot of links (generally). I doubt that having tens of thousands of any links will move you up to the ladder, regarding Sitelinks. Whilst links will help I have explained above (in the Procedures section), specifically, in what way they will help. 
Some advices were really something like : “Make the website useful” or “Add Meta tags”. Whilst these are surely helpful for any website, they may have nothing to do with your website getting Sitelinks. 
Having a very well designed navigation menu. There were websites which had erratic or very well designed navigation menus and links within the website and still they all got Sitelinks. 
Pagerank has nothing to do with Sitelinks. There are PR7 and PR2 websites that got Sitelinks. 
Although I don’t want to contradict (I just did that, but well .. ) my fellow colleagues, the above are my personal opinions and I wanted to stress them out. The reason I didn’t named names is obvious.


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