Try to describe the methods of field investigation and the advantages and disadvantages of each method.

A: (1) Access method, also known as inquiry method. It takes inquiry as the means of investigation, and puts forward the contents to be investigated to visitors in the form of interview, telephone, text and internet. To get the information you need. This is the most commonly used method of market research. Its advantage is that investigators directly ask the respondents and get more reliable information, but its disadvantage is that it needs more manpower and time.

(2) Observation method is a kind of investigation method in which investigators go directly to the investigation site and observe or record with instruments (such as cameras, video cameras, tape recorders, etc.). ). It is divided into direct observation, trace observation and behavior record. The main advantage of observation method is that investigators observe the actual actions of the respondents, not just through their answers, so the survey results are more objective. The disadvantage is that we can't explain the reasons, motives and opinions by observing the scene where the facts happened.

(3) Experimental method is a method to obtain market survey data through experimental comparison. Its advantage is that the method is scientific, and it can analyze and study whether there is causality between some market variables and the influence of the change of independent variables on the dependent variables in a controllable way, so as to obtain more correct information, data and related information. Its disadvantages are: it is not easy to choose the same experimental conditions, it is not easy to master the changing factors, it is not easy to compare the experimental results, it takes a long time to complete the experiment and the cost is high.