If something is informal, it does not have set rules.
There are no informal rules of congress.
Rules that are promulgated are rules that are adopted by some sort of governing body or agency of a government. There are many formal and informal processes by which this can be accomplished.
Informal rules often rely on previous instructions and formed habits. For example, most people follow the informal rule to enter a conference room quietly when the Keynote Speaker is already talking or the activity is already in progress. Most humans follow hundreds of informal rules every day.
Formal refers to following established rules and regulations. Informal is more relaxed because the rules aren't really acknowledged. Businesses have both formal and informal groups.
pops
no one knows for sure!
An informal group is a group that has no written rules controlling the behavior of their members.
A protocol is a set of rules that are standard for a telecommunications network. These rules will outline procedures and controls that are in place for the network.
This means to officially publish the informal rules.
pseudocode
protocol
learned by modeling our behavior after our parents and others.