What are the elements of conspiracy?

The elements of conspiracy are

• An agreement between two or more people.
• The intentional to carry out an act that is unlawful or one that is lawful but is to be accomplished by unlawful means.
• A culpable intent of the part of the defendants.

(from Criminal Law Today: fourth edition: by Frank Schmalleger and Daniel E. Hall, with John J. Dolatowski.)