The word, 'quality forecast' feels out of place to me tbh
I have always believed that a quality forecast in sports betting is extremely important.
Certainly, because on it your winning depends on.
...However, creating a quality forecast is always a problem of additional information and better processing of this information. Write what you think about a quality forecast, its role in a gaming system and the methods of its construction.
If I am understanding, 'method of construction' right then I would say, just watch the sports you are interested in and it'll come naturally; the good the knowledge of sports you have, the better your predictions will be.