| Occupations | Definition | Examples |
| Primary | Occupation which directly depend on nature are called primary occupations. | Farming, animal husbandry, mining, foresting, fishing. |
| Secondary | Occupations dependent on primary occupations are called secondary occupations. | Food processing, manufacturing, construction. |
| Tertiary | Occupations which provide complementary services to primary and secondary occupations are called tertiary occupations. | Transport of goods, commercial services, loading and unloading goods, sale of goods. |
| Quaternary | The occupations which requires special expertise and special skills are called quaternary occupations. | Quality testing of food products, inspection and maintenance., IT. |
