However, Wallerstein was keen to move beyond the static dualism of the dependency models. Rather than viewing the world in terms of score' and 'periphery', Wallerstein identified three groupings of countries: Core semi-periphery' and 'periphery'. In addition, the members of these categories were not fixed, over time countries were able to move in and out of categories depending on their economic situation. The inclusion of the 'semi-periphery' was a reflection of global events in the late 1960s and early 1970s. While dependency theorists were arguing that countries in the global periphery were doomed to be forever exploited and marginal, some countries of the world were experiencing economic development in terms of industrialization. These newly-industrializing countries (NICs) included the "Asian Tigers' of South Korea, Hong Kong, Singapore and Taiwan, as well as Latin American nations such as Brazil.