The main way in which artisan guilds changed labor and social class in medieval Europe is that it gave the artisans, who were mostly members of the lower class, more power--since these guilds acted somewhat like a modern "union" and helped them negotiate better pay.
Answer:
To make correct and effective decisions on a particular issue. To communicate the current problems regarding particular issue to concerned higher authority. To clear the existing unclear rules and regulations or amend them.
