1. TECHNOLOGY
   1. PROTOCOL LEVEL TEST
      1. HTTP/HTTPS
      2. WEB SERVICES
      3. FTP/SMTP
      4. etc
      5. Open Source / Free Tools
   2. PRODUCT LEVEL TEST
      1. RIA Applications
      2. SIEBEL RICH
      3. SAP GUI
      4. CITRIX / TERMINAL SERVER
      5. etc
   3. Commercial Tools
2. VUSER NUMBER
   1. CONCURRENCY LEVEL
      1. USER
      2. OPERATION
      3. TRANSACTION
3. INFRAESTRUCTURE
   1. INTEGRATION WITH OTHER TOOLS
   2. RESOURCE MONITORING INTEGRATION
4. NUMBER OF TESTS
   1. HIGH APPLICATION NUMBER + HIGH TESTS NUMBER
   2. HIGH APPLICATION NUMBER + LOW TESTS NUMBER
   3. LOW APPLICATION NUMBER + HIGH TESTS NUMBER
   4. LOW APPLICATION NUMBERS + LOW TESTS NUMBER
   5. Commercial Tools
   6. Open Source Tools
5. ENVIRONMENT
   1. HOSTING
   2. CLOUD
      1. CLOUD TESTING TOOLS
         1. BLAZEMETER (JMETER in the cloud)
         2. SOASTA
         3. NEOTSYS
         4. etc
6. LICENSE
   1. FREE
   2. FIXED
   3. RENTING
   4. PAY PER USE