Following steps will describe structured approach to Testing.

Test Planning

•  Define what to test
• Identify Functions to be tested according to system requirements
• Test conditions
• Manual or Automated  
• Scope of Performance testing
• Prioritize to identify Most Important Tests  
• Record Document References 
• Defects, Priority and Resolution
• Risks and Mitigation
• Schedule and Resource Planning

Test Design

•  Define how to test
• Identify Test Specifications
• Build detailed test scripts or cases
• Automation Script generation
• Documentation

Test Execution

• Define when to test
• Build test execution schedule 
• Record test results
• Reporting Defects 
• Defect validation and Regression Testing