Knowing the local dialect is of considerable social benefit, and most Chinese who permanently move to a new area will attempt to pick up the local dialect. Learning a new dialect is usually done informally through a process of immersion and recognizing sound shifts. Generally the differences are more pronounced lexically than grammatically. Typically, a speaker of one dialect of Chinese will need about a year of immersion to understand the local dialect and about three to five years to become fluent in speaking it. Because of the variety of dialects spoken, there are usually few formal methods for learning a local dialect.