The Labor Contract Law, the Law on Labor-dispute Mediation and Arbitration, the Regulations on Implementation of the Labor Contract Law, and other such laws and regulations have enhanced the protection on the employees' rights and interests, thus increasing awareness of labor rights. The number of labor dispute cases that the People's Court receives has also increased, but there are still a wide variety of problems that have yet to be solved within the judicial practice. For the purpose of guiding the judicial practice and solving various problems, the Supreme People's Court promulgated the Interpretation of the Supreme People's Court on Certain Issues Concerning the Application of Law in Trying Cases Involving Labor Disputes (IV) (hereinafter referred to as “Interpretation IV”) on January 18, 2013. The Interpretation IV came into effect on February 1, 2013.