Legal research is the process of finding existing information that supports legal a legal premise and documenting the source. Properly conducting research can help an attorney with preparing documents which is the value of legal research. Legal materials are divided into primary and secondary. This includes textbooks, practice manual, and documents. When conducting legal research it is good to start out with the secondary source. Restatements of law are “to promote the clarification and simplification of the law and its better adaptation to social needs,” Sources of law include constitutions, treaties and common law. The US Constitution was signed September 17,1787 and was adopted in 1978, it established the structure and power of America. A statute is a written law passed by the U.S. Congress or a state legislature and signed into law, or allowed to become law, by the President of the United States. A regulation is a rule, adopted under authority granted by a statute and issued by a municipal, county, state, or federal agency. “ Common law” is a body of commonly applied legal principles which govern all areas not specifically covered by statutory or constitutional law. Stare decisis "contributes to the integrity of our constitutional system of government, both in appearance and in fact," The legal basis for the existence of the federal court system can be found in Article III, §1, of the Constitution which provides that “[t]he judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish.” The Supreme Court of the United States