Sorry for my english is not very good The difficulty of the course is divided into 7 levels as follows: - Difficulty from 0 - 15% | No compete (on page optimization to achieve high position). - Difficulty 16 - 30% | low competition (in good page optimization and build a few links). - Difficulty 31 - 45% | Compete average (good page optimization and link building average). - Difficulty 46 - 60% | Competitive really (very good page optimization and link building strong). - Difficulty 61 - 75% | Competition higher (optimized in very good site, well established history and a powerful link building). - Difficulty 75 - 90% | Fierce competition (history set very good, powerful and overwhelming link) - Difficulty 91% | Competition on the Internet. The factors to determine the difficulty of the keywords (1). The average CPC for Google Adwords keywords (2). Number of keyword searches last month (3). Total results search keywords in quotes (4). The total number of search results with the allintitle command (5). The total number of search results with intitle command (6). The total number of search results with inanchor statement (7). Strength index trunh average of the top 10 pages for keywords (1). The average CPC for Google Adwords keywords Score: x1 Unit:% : = (Average CPC Google Adwords for keywords * 100) / CPC trunh comment Google Adwords for keywords that have the highest value According to our current survey, the term "search engine optimization" has the highest average CPC value. (2). Number of keyword searches last month Score: x1 Unit:% : = (Number of keyword searches last month * 100) / Total number of hits on keyword search "hot" month According to our current survey from Google Insight for Search, the term "film" is the most searched (**) Use Google Keyword Tool to determine the number of keyword searches last month (***) If the search can not determine the value = 1 (3). Total results search keywords in quotes Score: x1 Unit:% : = (Total number of search results lock in quotes * 100) / Total number of search results the word "hot" in quotes According to our current study, the word "it" has the most number of results (4). The total number of search results with the allintitle command Score: x1 Unit:% : = (Total search results with the allintitle command for keywords * 100) / total search results with allintitle statement for the word "hot" According to our current study, the word "it" has the most number of results (5). The total number of search results with intitle command Score: x1 Unit:% : = (Total results with intitle command for keywords * 100) / total search results with intitle statement for the word "hot" In our current study, the word "it" has the most number of results (6). The total number of search results with inanchor statement Score: x1 Unit:% : = (Total results with inanchor statement for keywords * 100) / total search results with inanchor for command word "hot" According to our current study, the word "it" has the most number of results (7). Average power index of the top 10 pages for keywords Score: x3 Unit:% : = (Power index of the page top 1 + strength index of top 2 + ... + The power of top page 10) / 10 Details on how to calculate the power index of 1 page (**) It is possible to shorten the time = (power index of the page top 1 + strength index of top 10 pages) / 2 or (power index of the page top 1 + strength index of the page top 5 + strength index page top 10) / 3 So Difficulty tag = ((1) * 1 + (2) * 1 + (3) * 1 + (4) * 1 + (5) * 1 + (6) * 1 + (7) * 3) / 9 For example: Specific keywords: "SEO Services" (1). The average CPC for Google Adwords keywords = (1.000 * 100) / 151.938 = 0.66% (2). Number of keyword searches last month = (1 * 100) / 55,600,000 = 1.8% (3). Total results search keywords in quotes = (4,800,000 * 100) / 6,080,000,000 = 0.08% (4). The total number of search results with the allintitle command = (1.870 * 100) / 171 000 000 = 0.001% (5). The total number of search results with intitle command = (17,600 * 100) / 171 000 000 = 0.01% (6). The total number of search results with inanchor statement = (1,060,000 * 100) / 5,390,000,000 = 0.02% (7). Average power index of the top 10 pages for keywords Top 1 = 29.90% Top 10 = 24.94% Thus the difficulty of the keyword "SEO services" under low competition and to achieve top 10, we need good page optimization and link building one number is not too large.