As you know, the most effective problem solving is most often achieved by using information from several sources.
It is difficult to predict in advance what is the optimal combination of using various sources - which of them will turn out to be the most complete and reliable.
The snowball method lies in the fact that as a result of using one or another source of information, new knowledge is obtained (hypotheses, facts, events or understanding of patterns). Having new knowledge, you can use it in combination with the same or another source of information - to gain previously unknown knowledge, etc.
New knowledge can be obtained almost endlessly, the main limitation is the time and the need to solve the problem.
Our skill lies in combining the use of a limited range of sources with the minimum time spent to solve the tasks at the proper level.