Choice of law is a procedural stage in the litigation of a case involving the conflict of laws when it is necessary to reconcile the differences between the laws of different legal jurisdictions, such as sovereign states, federated states (as in the US), or provinces. The outcome of this process is potentially to require the courts of one jurisdiction to apply the law of a different jurisdiction in lawsuits arising from, say, family law, tort or contract. The law which is applied is sometimes referred to as the "proper law".
Sequence of events in conflict cases1.Jurisdiction. The court selected by the plaintiff must decide both whether it has the jurisdiction to hear the case and, if it has, whether another forum is more suitable (the forum non conveniens issue relates to the problem of forum shopping) for the disposition of the case. Naturally, a plaintiff with appropriate knowledge and finance will always commence proceedings in the court most likely to give a favourable outcome. This is called forum shopping and whether a court will accept such cases is always determined by the local law.
2.Recognition of foreign judgments. Even where a conflict of laws exists, the court will recognize the validity of a foreign judgment in most cases. Under U.S. law, this authority is part of the Full Faith and Credit Clause of the U.S. Constitution. Under International law, this authority is part of the doctrine of comity. The court will invoke comity by its discretion and will usually look to two factors before using its discretionary powers: did the foreign court have jurisdiction, and were fair procedures used in adjudicating the case?
3.Characterization. The court then allocates each aspect of the case as pleaded to its appropriate legal classification. Each such classification has it own choice of law rules but distinguishing between procedural and substantive rules requires care. The court may have adopted a rule of law which prevents it from applying any procedural law other than its own. This can include the court's own choice of law rules. A danger exists if the choice of law requires that a case be heard elsewhere due to the forum's lack of expertise in deciding an issue of foreign law.
4.The court then applies the relevant choice of law rules. In a few cases, usually involving Family Law, an incidental question can arise which will complicate this process. The United States has adopted two laws that almost universally eliminate incidental questions involving family law. The Defense of Marriage Act (DOMA), permits states to ignore the doctrine of lex loci celebrationis and apply only the laws of the forum state when deciding whether a marriage is valid. The Uniform Child Custody Jurisdiction and Enforcement Act (UCCJEA) requires states to apply the law of the "home state;" that is, the forum which originally determined custody and maintenance. A state court will only apply its own law when no parent retains a connection with the original jurisdiction and when substantial evidence is available in its forum to make a custody or maintenance determination.
 Choice-of-law stageThe "traditional approach" looks to territorial factors, e.g. the domicile or nationality of the parties, where the components comprising each cause of action occurred, where any relevant assets, whether movable or immovable, are located, etc., and chooses the law or laws that have the greatest connection to the cause(s) of action. Even though this is a very flexible system, there has been some reluctance to apply it and various "escape devices" have developed, which allow courts to apply their local laws (the lex fori) even though the disputed events took place in a different jurisdiction. The parties themselves may plead the case either to avoid invoking a foreign law or agree to the choice of law, assuming that the judge will not of his or her own motion go behind the pleadings. Their motive will be pragmatic. Full-scale conflict cases take longer and cost more to litigate. However, the courts in some states are predisposed to prefer the lex fori wherever possible. This may reflect the belief that the interests of justice will be better served if the judges apply the law with which they are most familiar, or it may reflect a more general parochialism in systems not used to considering extraterritorial principles of law. One of the most common judicial strategies is to skew the characterization process. By determining that a claim is one involving a contract instead of tort, or a question of family law instead of a testamentary issue, the Court can change the choice of law rules. For example, if an employee is hired by an employer in State A, is injured due to the employer's negligence in State B, and files a lawsuit to recover for the injury in State A, the court in State A might look to the employment contract to see if it contained a clause that governed the employer's duty of care with respect to the employee. If so, the court may be able characterize the claim as a breach of the contract, instead of a tort, and apply the law of the State A either because it was the place where the contract was made (the lex loci contractus) or, if it were the place where the wage or salary was to be paid, where the contract was intended to be performed (the lex loci solutionis).
In this context, it is noted that, since the 1960s, the courts in the United States began developing a number of new approaches, as well as new escape devices. This reflects the number of different laws that might be relevant in any given case before an American court. There is significant interstate trade and social mobility, and with the laws of each state of the Union representing a possible opportunity for conflict, it was necessary to produce a coherent system that could be applied in the courts of all fifty states.
 RenvoiTo limit the damage that would result from forum shopping, it is desirable that the same law is applied to achieve the same result no matter where the case is litigated. The system of renvoi, which literally means "send back", is an attempt to achieve that end.
Conflict of laws (or private international law) is a set of procedural rules that determines which legal system and which jurisdiction's applies to a given dispute. The rules typically apply when a legal dispute has a "foreign" element such as a contract agreed to by parties located in different countries, although the "foreign" element also exists in multi-jurisdictional countries such as the United Kingdom, the United States, Australia and Canada.
The term conflict of laws itself originates from situations where the ultimate outcome of a legal dispute depended upon which law applied, and the common law courts manner of resolving the conflict between those laws. In civil law lawyers and legal scholars refer to conflict of laws as private international law. Private international law has no real connection with public international law, and is instead a feature of local law which varies from country to country.
The three branches of conflict of laws are
Jurisdiction – whether the forum court has the power to resolve the dispute at hand
Choice of law – the law which is being applied to resolve the dispute
Foreign judgments – the ability to recognize and enforce a judgment from an external forum within the jurisdiction of the adjudicating forum