What are the elements of the tort of conspiracy?

In Harris v. GlaxoSmithKline Inc. (2010), 2010 ONSC 2326, 101 O.R. (3d) 665, [2010] O.J. No. 1710, Perell J. identified the elements of the tort of conspiracy and the two different ways in which a conspiracy may be committed, and therefore pleaded, at para. 74: In Canada, the tort of conspiracy can be committed in two discrete ways that may arise on the same set of facts; namely, (1) by two or more persons using some means (lawful or unlawful) for the predominate purpose of injuring the plaintiff; and (2) by two or more persons using unlawful means with knowledge that their acts were aimed at the plaintiff and knowing or constructively knowing that their acts would result in injury to the plaintiff. The other elements of the tort of conspiracy are: (a) an agreement to injure between two or more persons; (b) acts in furtherance of the agreement to injure; and (c) the plaintiff suffering damages as a result of the defendants' conduct.