Even one will wonder what exactly is Test Driven Development (TDD) in software development. Let me tell you that it is most recent approach in IT industry for developing a software. Test-driven development starts with designing and developing tests for every small functionality of an application.
In TDD approach, first  the test is developed which specifies and validates what the code will do. The  test might fail as the tests are developed even before the development.  Development team then develops and refactors the code to pass the test.  Test-driven development is related to the test-first programming evolved as  part of extreme programming concepts.
  This test have process in which it flows: 
Design & Add a  Test >>> Run all tests and see (check it fails or pass)>>>  Run tests and Refactor code >>> Repeat
  Test-driven development can produce applications of high  quality in less time than is possible with older methods. Proper implementation  of TDD requires the developers and testers to accurately anticipate how the  application and its features will be used in the real world. The methodical  nature of TDD ensures much higher coverage and first-time quality than classic  phased code > test > fix > retest cycles. Because tests are conducted  from the very beginning of the design cycle, time and money spent in debugging  at later stages is minimized.
  
How TDD will help you / Benefits of TDD -
Implementation 
  If your organization doesn’t know where or how to start with  TDD, our proven approach helps teams come up to speed quickly with minimal  disruption to the overall velocity of the teams. Contact us for implementing  TDD at your organization with confidence.
  If your organization has never done developer testing  before, will help your members of the team by educating them. Use the resources  below for educational and reference materials. Begin to track the performance  immediately; because that will give quick feedback on how rapidly the team is  adopting TDD, even if it is a very low form of adoption at first.
  Tools are critical for creating and managing unit tests.  Training will given to the team on using new tools and discover which practices  and features of the tools will work best in your environment.
  Specify modest, attainable goals when implementing TDD. For  instance, instead of insisting that every code change must have a developer  test starting now, it may be better to limit TDD practices to a single  important implementation element. This will allow the team to come up to speed  on tools and learn new development habits while minimizing the impact on the  overall schedule. After the team has gained some comfort with the new way of  doing things a refined method for TDD can be applied to all new or changed  code. Continue increasing the team's capabilities with TDD by introducing new  tools, constraints, monitoring, or methods in modest, attainable increments.  This also allows the team to experience success with new techniques, which  usually leads to a team that embraces rather than resists change.
How cotocus will help  you / our offer - 
  We offer a spectrum of mini services including training and  maturity assessments, along with TDD implementation.
  Training – We  offer comprehensive training on multiple technology stacks including  Ruby/Cucumber/WATiR and .NET/SpecFlow. Our classes include hands-on single day  workshops as well as weeklong in depth training.
  Assessments – Are  your automation efforts not achieving the desired results for the investment?  Our assessment can help determine how effective and efficient your automation  efforts are and provide a roadmap to address opportunities for improvement.
  Consulting - Got  stuck somewhere, you are not even skip. We are here to help you out. Our team  of expert will look after your situation and will help you with best and  effective solution to come out of that situation.  
TDD is a new way of thinking about testing. Failing to plan and manage how the team's behavior needs to change over time increases the chance of failing at TDD. Keep the team focused on TDD, and watch for the team falling back into old habits.