Keyword Use Factors
Keyword Use in Title Tag
Placing the targeted search term or phrase in the title tag of the web page's HTML header
4.9   Exceptional Importance
Keyword Use in Body Text
Using the targeted search term in the visible, HTML text of the page
3.7   High Importance
Relationship of Body Text Content to Keywords (Topic Analysis)
Topical relevance of text on the page compared to targeted keywords
3.4   High Importance
Keyword Use in H1 Tag
Creating an H1 tag with the targeted search term/phrase
3.3   High Importance
Keyword Use in Domain Name
Including the targeted term/phrase in the registered domain name, i.e. keyword.com
3     Moderate Importance
Keyword Use in Page URL
Including target terms in the webpage URL, i.e. seomoz.org/keyword-phrase
2.8   Moderate Importance
Keyword Use in H2, H3, H(x) Tags
Placing targeted terms in the H2, H3 headline HTML tags
2.8   Moderate Importance
Keyword Use in Alt Tags and Image Titles
Using target keywords inside alt HTML tags and img title tags
2.6   Moderate Importance
Keyword Use in Bold/Strong Tags
Positioning keyword in HTML text with strong/bold attributes
2.3    Moderate Importance
Keyword Use in Meta Description Tag
Utilizing keywords in the meta description tag in a webpage's HTML header
2     Moderate Importance
Keyword Use in Meta Keywords Tag
Utilizing keywords in the meta keywords tag in a webpage's HTML header
1.2    Slight Importance