What are the advantages and disadvantages of description method, sampling method and evaluation method?

The advantages and disadvantages of the three are as follows:

The advantage of 1. description method is that it can provide detailed information about the behavior or activity of the observed object and the environmental background when it occurs, thus laying a good foundation for multi-angle and multi-level analysis in the future. Its disadvantages are that it requires high recording technology, traditional manual recording is easy to lose sight of one thing and another, and it takes more time and manpower to record and process data.

2. The advantage of sampling method is that it can fully understand the research object, but the disadvantages are that the object selection is biased, the observation samples are not representative, the observer candidates are limited, the observation training is difficult, and the limited samples cannot be used as meaningful inference, which is time-consuming and laborious.

3. The advantages of the evaluation method mainly lie in its long-term effectiveness and simple operation, but its disadvantages are not available at present.