Questions of constitutionality are considered a type of question of law, and thus appellate courts always review lower court decisions that address constitutional issues "de novo". However, the term "standard of review" has an additional meaning in the context of reviewing a law for its constitutionality, which concerns how much deference the judiciary should give the legislature (i.e., the federal Congress or state legislatures) in determining whether legislation is constitutional. Concerning constitutional questions, three basic standards of review exist: rational basis, intermediate scrutiny, and strict scrutiny. This form of standard of review is sometimes also called the standard or level of scrutiny.