A Cost-Benefit Analysis of Immigration Policing in Gauteng, Forced Migration Studies Programme, Johannesburg. Following the sections on the volume and nature of employment, the chapter examines occupational change using a demographic decomposition method. Comparisons are also made between the human capital of native-born and immigrant workers, including with regard to skills mismatch. Although new legislation was introduced in the early 2000s, there was also a continuation of past migration policies focusing on security issues.