The 200 Google algorithm parameters
(SEO Checkliste)

Domain: 12 Factors

1. Age of the domain
2. Domain registration duration
3. Visibility of the domain's registration information
4. Site Top-Level Domain (geographical orientation, z.B. .com versus co.uk)
5. Site Top.Level Domain (e.g. .com versus .info);
6. Subdomain or root domain?
7. Domain history (How many times has the IP changed?)
8. Owner of the domain (How many changes of ownership have there been?)
9. Keywords in the domain
10. Domain IP address
11. Neighbors on the IP address
12. External mentions of the domain (not linked)

Server: 2 Factors

1. Geographical location of the server
2. Availability of the server

architecture: 7 Factors

1. URL-Structure
2. HTML-Structure
3. Semantic structure
4. Use of external CSS / JS files
5. Accessibility of the website structure
   (Using inaccessible navigation, Java Script etc.)
6. Use of canonical urls
7. “Correct” HTML code (?)

content: 11 Factors

1. Language of the content
2. uniqueness
3. Amount of content (Text versus HTML)
4. Density of the unlinked content (Links versus Text)
5. Share of textual content (without links, photos, Code etc.)
6. Topicality and timelessness of the content (z.B. for seasonal search)
7. Semantic information
   (Phrase-based indexing and phrase indicators used multiple times)
8. Content flag for general category (transaction, Information, Navigation)
9. Content / market niche
10. Use of certain keywords (Gambling, etc.)
11. Text in pictures (?)

Internal linking: 5 Factors

1. Number of internal links on a page
2. Number of internal links to a page with identical / targeted anchor text
3. Number of internal links to the page from the page content
   (instead of links from the navigation, Breadcrumb usw.)
4. Number of links with the “nofollow” attribute (?)
5. Internal link density

Website factors: 6 Factors

1. Contents of the robots.txt file
2. Frequency of site updates
3. Scope of the site (Number of pages)
4. Age of the page in terms of the first inclusion on Google
5. XML sitemap
6. On-page factors to build trust (z.B. About Us Page, correct spelling and grammar, Avoiding words from certain areas, full contact details)

Page-specific factors: 9 Factors

1. Meta-Robots Tags
2. Age of the page
3. Topicality of the page
   (Frequency of changes and percentage of parts of the page changed)
4. Duplicate content with other pages on the site (interner duplicate Content)
5. Legibility of the page content
6. Page load time
7. Page type (About us page versus main page with content)
8. Internal popularity of the site (Number of internal links)
9. External popularity of the site
   (Number of external links in relation to other pages on the site)

Use of keywords and prominence of the keywords: 11 Factors

1. Keywords in the page title
2. Keywords at the beginning of the page title
3. Keywords in the alt tags
4. Keywords in the anchor text of the internal links (internal anchor text)
5. Keywords in the anchor text of outbound links
6. Keywords in bold or italic text (?)
7. Keywords at the beginning of the main text
8. Keywords in the main text
9. Synonyms keywords related to the subject of the page / site
10. Keywords in filenames
11. Keywords in the url

outgoing links: 8 Factors

1. Number of outbound links (pro Domain)
2. Number of outbound links (per page)
3. Quality of the pages, to which is linked
4. Link to bad neighborhood
5. Relevance of the outbound links
6. Left on 404- and other error pages
7. Links to SEO agencies from customer site
8. linked images

Backlink-Profil: 20 Factors

1. Relevance of the linking sites
2. Relevance of the linked pages
3. Quality of the linking sites
4. Quality of the linking website
5. Backlinks within a network of pages
6. Mentions (Pages with similar backlink sources)
7. Diversity of profiles
8. a. Variety of link texts
   b. different IP addresses of the linking sites
   c. geographical diversity
   d. different TLDs
   e. Thematic diversity
   f. Different types of linking sites (Logs, Directories etc);
   g . Variety of placement of links
9. Links from authority pages(CNN, BBC, etc)
10. Backlinks from bad neighborhoods
11. Relationship of reciprocal links (compared to the general backlink profile)
12. Relationship of links from social media services
    (Links from social media sites vs.. entire backlink profile)
13. Backlink trends and patterns
    (z.B. sudden increase or decrease in the number of backlinks)
14. Mention in Wikipedia and Dmoz
15. Historie des Backlink-Profiles (caught buying or selling links, etc.)

Every single backlink: 6 Factors

1. Authority of the TLD (.com versus .gov)
2. Authority of the linking domain
3. Authority of the linking page
4. Location of a link(footer, Navigation, Main column)
5. Link anchor text (and alt tags of linking images)
6. Title attribute of a link (?)

Visitor profile and behavior: 6 Factors

1. Number of visitors
2. Demographic characteristics of the visitors
3. Bounce-Rate
4. Browse properties of visitors (other sides, that they visit)
5. Trends and patterns among the visitors (z.B. sudden increases in traffic)
6. Number of clicks on the search engine results pages
   (in relation to other entries)

Punish, Filters and manipulations: 10 Factors

1. Excessive use of keywords / Keyword stuffing
2. bought links
3. links sold
4. known as a spammer (Comments, Forums, other link spam)
5. Cloaking
6. Hidden text
7. Duplicate Content (external duplication)
8. History of penalties for this domain
9. History of penalties from the owner
10. History of penalties from other sites by this owner (?)

Other factors (6):

1. Registering the domain with Google Webmaster Tools
2. Presence of the domain on Google News
3. Presence of the domain in the Google Blog Search
4. Use of the domain in Google AdWords
5. Use of the domain with Google Analytics
6. external mention of the name