If you know what phylosofy Google is after, it will help big time to find out how they are doing it.
It is not completely true that I don't give some technical explanation:
The set-theory is part of the technical explanation,.. but I think you can say that there is a pretty big change in phylosofy as to what relevant results are. It wouldn't surprise me that this change is based on user opinions.
The SET THEORY as I understand it works like this:
A group can be split up into smaller groups which can be spilt up into smaller groups which can be ...... etc. etc. etc.
To use Leanns example again:
The group "designer" can be split up into smaller groups of "indoor designer", "civil designer", "web designer", etc. etc. etc.
The group "web designer" can be split up into smaller groups of "e-commerce web designer", "custom web designer", etc. etc. etc.
so you get kind of a directory structure:
----> indoor designer
----> civil designer
----> web designer
----> e-commerce web designer
----> custom web designer
When a searcher does a search for "designer" he doesn't tell what type of designer he is looking for,.. so what would be the most relevant result?...... To show as many different types of designers there are.
When a searcher does a search for "web designer" he doesn't tell what type of web designer he is looking for,.. so what would be the most relevant result?...... To show as many different types of web designers there are.
When a search does a search for "custom web designer" he tells exactly what type of web designer he is looking for,.. so he finds Leann.
In the past this logic was not applied. Google did not look at grammer or meaning of a phrase,.. it just looked at words and how they were positioned. So a "custom web designer" was also a "custom web", a "web designer" and a "custom designer" and it just depended on competition how you would rank for each of them. But not anymore,... Now it seems Google looks at the whole term and uses grammer and meaning of words to determine relevancy.
In my opinion this is a huge improvement in search technology, and SEO won't suffer from it,.. just like Google changed the phylosofy a bit, SEO needs to do the same.
Generally algorithm updates are technical,.. but this time it is more phylosofical or acedamical if you like (which doesn't surprise me a bit considering the background of Surgey and Larry).