Written or oral materials prepared by or for an [wex:attorney] in the course of legal representation, especially in preparation for litigation. Generally, an opposing party may not discover or compel [wex:disclosure] of work product. In limited circumstances, however, an opposing party may discover or compel disclosure of work product upon a showing of "substantial need" and "undue hardship." Fed. R. Evid. 26(b)(3).
See, e.g. Hickman v. Taylor, 329 U.S. 495 (1947).
[wex:Attorney work product privilege]