The Dilution Index, or SEO-DI, is a number that represents the average number of pages competing for each search of a specific search term.

SEO-DIF gives us on instant view of which keyphrases are more liable for high ranking. We can analyse with a more scientific vision. If we want to go up Google’s index you need to quickly write articles about these products (even if they are about the competitors – be careful with legal issues, that is your responsibility!) and than you can restructure your pages to intercept visitors from other sites by giving them what they want under your domain.

Objective That means if the Dilution is high you have more changes to be ranked higher. Important! The best dilution is the one that fits in your SEO plan! Formula Dilution Index Formula D.I. = (Number of searches * 100) / Number of results How to do it?

Choose the keywords you are interested in; Get a list of related keywords (search terms people type when searching for the keyword you have chosen); Get the number of searches per month for each related keyword; Get the number of results, given by Google – for this keyword, per month for each related keyword; Calculate the formula; Analyse.

Analysis

List all keywords with descendent order of SEO-DI (from higher to lower); To select the best keywords for your SEO project, you should ignore the ones with SEO-DI bellow 0.01 (unless you don’t have many options above 1.00) and ignore the ones with average volume of searches bellow 300 per month (the best keywords are the ones that people search on.. Less than 10 per day won’t represent good business!); Delete keywords you don’t think is worth investing on, even if they have the best dilutions. This is because of the “human factor”. To delete the words that don’t fit to your SEO strategy, just answer these two questions: 1) Can I do business with people searching this term? 2) Can I afford to spend my time, and resources, writing articles about this search term? The best dilution is the one that fits in your SEO plan! You should end up with a nice, juicy, list of terms waiting to become more competitive, and who gets first, gets high!

Example for and SEO project Keywords selection plan: To find the best 5 terms that represent the search phrase “cms php” (which means I want to know about Content Management Systems developer in PHP), for my new free and simple CMS system, targeting a generic PHP developers comunity.

11 Best diluted keywords related with “cms php”:

KeywordNumber of ResultsAverage vol.Dilution jojo 26,800,000 823,000 3.07 modx cms 336,000 8,100 2.41 drupaled 33,500 590 1.76 modex cms 8,240 46 0.56 articlelive template 14,900 58 0.39 articlelive nx 36,700 140 0.38 expressionengine 1,160,000 3,600 0.31 articlelive 309,000 720 0.23 drupal 27,700,000 60,500 0.22 copyright 2002 by php nuke 576,000 1,000 0.17 drupal org 4,740,000 5,400 0.11 drupal 5.1 377,000 320 0.08 cms 134,000,000 110,000 0.08 c m s 134,000,000 110,000 0.08 drupal websites 709,000 480 0.07 opencms 2,600,000 1,300 0.05 dasboard 824,000 390 0.05 phpfusion 10,100,000 4,400 0.04 open source cms 8,720,000 3,600 0.04 portal demo download 1,630,000 590 0.04 opensourcecms com 1,000,000 320 0.03 powered by php fusion 4,450,000 1,000 0.02 content management system 122,000,000 27,100 0.02 simple cms 4,550,000 880 0.02

Data source: SEMRush.com This list I can identify that most of whom search for “cms php” want to get information about specific CMS tool: Jojo, Drupal, Modx CMS, Expressionengine, Articlelive are all fantastic systems and people want to know more about them. I could

Make articles tearching people how to migrate from these softwares to mine; and vice and versa. Promote my addons by makeing them available to use with these other CMS systems. Or I could just ignore them and try build my way up ranking targeting only the keywords that aren’t related to competitors.

What I would do

From the list above, I would delete ‘modex cms’, ‘articlelive template’ and ‘articlelive nx’ for low average volume. Because its dubious meaning, I would ignore: ‘cms’ and ‘c m s’ Because the competition is tremendous (with PR of 7, 8 and 9), I would ignore: ‘open source cms’ and ‘content management system’ Now we only have competitors remaining, and although it will be hard to rank higher than drupal.org for searching ‘drupal’, we will still be among lower competition and better dilution and other generic terms. So that’s what we should go for. I would focus on: ‘jojo cms’, ‘modx cms’, ‘drupal cms’, ‘articlelive cms’ and ‘cms php’. Yes, ‘cms php’ must get in the list!

We have our first list Keywords chosen jojo cms modx cms drupal cms articlelive cms cms php