Industrial Photography Around The World

Secondary - This group is involved in the processing products from primary industries. This includes all factories—those that refine metals, produce furniture, or pack farm products such as meat.
Tertiary - This group is involved in the provision of services. They include teachers, managers and other service providers.
Quaternary - This group is involved in the research of science and technology. They include scientists.
As a country develops people move away from the primary sector to secondary and then to tertiary.