From how many sources does this constitution, on which the Constitution of Alberta is modeled, draws?
Constitution of the United Kingdom The United Kingdom does not have one specific constitutional document named as such. Instead, the so called constitution of the United Kingdom is a sum of laws and principles that make up the body politic of the UK. This is sometimes referred to as an "unwritten" or uncodified constitution. The British constitution primarily draws from four sources: statute law (laws passed by the legislature), common law (laws established through court judgments), parliamentary conventions, and works of authority. Similar to a written constitution, this sum also concerns both the relationship between the individual and the state, and the functioning of the legislature, the executive and judiciary.
Living tree doctrine In Canadian law, the living tree doctrine (French: "théorie de l'arbre vivant" ) is a doctrine of constitutional interpretation that says that a constitution is organic and must be read in a broad and progressive manner so as to adapt it to the changing times.