Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

[Q]: The Catechism of a Revolutionary refers to a manifesto written by Russian revolutionary Sergey Nechayev between April and August 1869 .
[A]: Catechism of a Revolutionary

[Q]: Dickerson v. United States , 530 U.S. 428 ( 2000 ) , upheld the requirement that the Miranda warning be read to criminal suspects and struck down a federal statute that purported to overrule Miranda v. Arizona ( 1966 ) .
[A]: Dickerson v. United States

[Q]: Profitability index ( PI ) , also known as profit investment ratio ( PIR ) and value investment ratio ( VIR ) , is the ratio of payoff to investment of a proposed project . It is a useful tool for ranking projects because it allows you to quantify the amount of value created per unit of investment .
[A]:
Profitability index