Restatements are primarily addressed to courts and aim at clear formulations of common law and its statutory elements, and reflect the law as it presently stands or might appropriately be stated by a court. Although Restatements aspire toward the precision of statutory language, they are also intended to reflect the flexibility and capacity for development and growth of the common law.
Principles are primarily addressed to legislatures, administrative agencies, or private actors. They can, however, be addressed to courts when an area is so new that there is little established law.
Codes (model or uniform) are addressed to legislatures with a view toward legislative enactment. They are written in prescriptive statutory language.