| Sampling | Non-sampling |
| 1. We take a part (sample) of the information 1. We take every items of the information for studies. | 1. We take every items of the information for studies. |
| 2. Inference are drawn from the sample of universe. | 2. Inferences are drawn from the data of complete universe. |
| 3. This is the recent method | 3. This is an old method |
| 4. Less difficulties are faced because fewer units of the large universe are observed | 4. Many difficulties are generally faced when the universe is large. |
| 5. A small number of trained investigators can collect the | 5. A large army of investigators may have to be appointed to collect the data |
| 6. It is more scientific | 6. It is not so scientific |
| 7. Possible and reliable in such cases. | 7. Only census method can be used in certain case such as for counting the population of a country. |
