Z:gnu-www-ja-free-encyclopedia--d61973-So it is important to welcome/en

So it is important to welcome and encourage smaller contributions. Writing a textbook for a whole semester's material is a big job, and only a small fraction of teachers will contribute that much. But writing about a topic small enough for one meeting of a class is a contribution that many can afford to make. Enough of these small contributions can cover the whole range of knowledge.