Bigrain Lin is the manager of international testing at Lenovo Mobile Group where he is responsible for field, carrier requirements and usability testing for all mobile products. Prior to Lenovo, Bigrain worked at HTC Corporation for ten years as a manager and engineer of global and China field testing. Today, he devotes his energy to test strategy and methodology development for emerging markets. He also spends time surveying and analyzing mobile phone user scenarios and preference models in different countries.