The index can be used to check whether your programming skills are still up to date or to make a strategic decision about what programming language should be adopted when starting to build a new software system. The definition of the TIOBE index can be found here. Since there are many questions about the way the TIOBE index is assembled, a special page is devoted to its definition. Ratings The ratings are calculated by counting hits of the most popular search engines. The search query that is used is +"<language> programming" The search query is executed for the regular Google, Google Blogs, MSN, Yahoo!, and YouTube web search for the last 12 months. The web site Alexa.com has been used to determine the most popular search engines. The number of hits determine the ratings of a language. The counted hits are normalized for each search engine for the first 50 languages. In other words, the first 50 languages together have a score of 100%. Let's define "hits50(SE)" as the sum of the number of hits for the first 50 languages for search engine SE and "hits(PL,SE)" as the number of hits for programming language PL for search engine SE, then the formal definition of the ratings becomes ((hits(PL,SE1)/hits50(SE1) + ... + hits(PL,SEn)/hits50(SEn))/n where n is the number of search engines used. http://0rz.tw/533Us -- ┌─────◆ＫＫＣＩＴＹ◆─────┐ ◢　◤ 找歌最方便 KKBOX 歌词搜寻!! │ bbs.kkcity.com.tw │ \^_^ / ★http://www.kkbox.com.tw★ └──《From:118.168.235.92 》──┘ 　 ◤ 唱片公司授权，音乐尽情下载 --