STLC descripbes the steps involved in the testing process. 
Following are steps involved:

1. Review of requirements.
2. Review of Design.
3. Black Box testing.

Following are different phases of STLC

1. Requirement understanding
2. Test Plan creation
3. Test Case creation
4. Bug Reporting

In STLC the steps involed are

1. Test Plan Prepration
2. Reveiw and approval of Test Plan
3. Test Case Prepration
4. Review and Approval of Test Case
5. Execution of Test Case
6. Logging and Verification of issues

These are the phase in STLC in broad phase

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Visit the Link for complete set of answer related to STLC

http://www.webspiders.com/en/testing_lifecycle.asp

srs 
frs
hld
lld
coding 
desgin
testing
implementation

Consider a example of human life cycle  first the baby is 
formed in utress , it develops limbs , grows ,,borns and 
dies at the old stage . In the same way software has got 
life cycle , i undergoes various process when it is 
developed or modified .
STEPS IN SDLC ARE 
1.Proposal
2.Request for proposal 
3.Negotation
4.LOI (letter of intent)
5.contract.
6.urs (user specfication)
7.srs
8.hld
9.lld
10.coding
11.unit testing
12.integration 
13.system testing
14.user acceptance test(UAT)
15.release with 90 days warranty
16.Maintainence
   -->fix bug
   -->upgradtion
   -->enhancement.

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1. Identify test candidates
2. Test plan
3. Design test cases
4. Execute tests
5. Evaluate results
6. Document results
7. Analysis/preparation of validation reports
8. Regression testing/retesting according to the followup 
bugs.

The STLC Lifecycle has several phases:
1.Effort Estimation
2.Project Initiation
3.System Study
4.Test Plan
5.Designing of Test Cases
6.Test Automation(if you are thinking of going in for   
Automation)
7.Execute Test Cases
8.Report Defects
9.Regression Testing
10.Analysis
11.Summary

1. Testplan
2. Test Development----Preparation of Test cases and test   
procedures.
3. Test excution
4. Result Analysis
5. Bug Tracking
6. Defect Reports.

Software TestLife Cycle shows a structure

      1. system study
      2. scope\approach\estimation
      3. Test Plan Design
      4. Test Case Design
      5. Test Case Review
      6. Test Case Execution
      7. Defect Reporting
      8. Gap Analysis
      9. Summary Report

system study (CRS and SRS)
     Test Plan Design
include many issues like scope,  test startegy,effort 
estimation, design of test cases, test case 
review,execution of test case, report,
            Summary Report

BRS
SRS
FRS
DESIGNING
1.HLD
2.LLD
CODING
TESTING
RELEASE

Basing on srs and sdd documents test plan is designed--
design test case--execution of test cases--result analysis--
bug tracking--reporting--dev--retesting/regression testing--
if pass close the bug

1.Study of requirements.
2.Test Planning / Approval of TEst Planning.
3.Test Case design / approval of test case.
4.Executing test case.
5.Reporting bugs.
6.Retesting if immediate solution came.
7.Regression testing .
8.Release

1 .  Test initiation 
2 .  Test plan design                        
3 .  Test case design 
4 .  Test Report 
5 .  Test Closure

S T L C: IT IS A CYCLIC PROCESS,WHICH CONTAINS 7 GENERIC PHASES.
1.Test Planning
2.Test Analysis
3.Test-Design
4.Construction & Verification
5.Testing Cycles
6.Final testing & implementation
7.Post Implementation

S/W Testing life cycle contains 6 phases;
1.Test Planning
2.Test Development
3.Test Execution
4.Result Analysis
5.Bug-Tracking
6.Reporting

STLC mainly consist of 2 phases
1)Verification  & 
2)Validation
                 Verification is the Reviewing part,in which
tester has to review all documents  related to URS(User
requirement specification),SRS(System requirement
specification),FRS(Function Requirement specification) etc.
                   
                 Validation is the actual testing
phase,where  tester has to perform testing as per the test
planning by using Black-Box & White box testing.there are
different validation method like,
1)Unit testing
2)Integration testing
3)function testing
4)System testing
5)Acceptance testing.

1)Requirements
2)Test Plan
3)Test case
4)Test Execution
   * Test log
5)Defect Tracking
6)Reports

This life cycle is used for standard applications that are
built from various custom technologies and follow the normal
or standard testing approach. The Application or
custom-build Lifecycle and its phases is depicted below:

Test Requirements  	 	 
• Requirement Specification documents
• Functional Specification documents
• Design Specification documents (use cases, etc)
• Use case Documents
• Test Trace-ability Matrix for identifying Test Coverage

Test Planning  	 	
• Test Scope, Test Environment
• Different Test phase and Test Methodologies
• Manual and Automation Testing
• Defect Mgmt, Configuration Mgmt, Risk Mgmt. Etc
• Evaluation & identification – Test, Defect tracking tools

Test Environment Setup  	 	
• Test Bed installation and configuration
• Network connectivity’s
• All the Software/ tools Installation and configuration
• Coordination with Vendors and others

Test Design  	 	
• Test Traceability Matrix and Test coverage
• Test Scenarios Identification & Test Case preparation
• Test data and Test scripts preparation
• Test case reviews and Approval
• Base lining under Configuration Management

Test Automation  	 	
• Automation requirement identification
• Tool Evaluation and Identification.
• Designing or identifying Framework and scripting
• Script Integration, Review and Approval
• Base lining under Configuration Management

Test Execution and Defect Tracking 		
• Executing Test cases
• Testing Test Scripts
• Capture, review and analyze Test Results
• Raised the defects and tracking for its closure

Test Reports and Acceptance 		
• Test summary reports
• Test Metrics and process Improvements made
• Build release
• Receiving acceptance