What is the test for establishing the element of causation?

Establishing the element of causation requires a showing that the defendant's breach was a substantial factor in bringing about the plaintiff's harm. (Ortega v. Kmart Corp., supra, 26 Cal.4th at p. 1205.) The plaintiff "'need not prove causation with absolute certainty,'" but must "'"'introduce evidence which affords a reasonable basis for the conclusion that it is more likely than not that the conduct of the defendant was a cause in fact of the result.'" [Citations.]'"

Page 11