I brought a couple posts from the Lean and Mean Litigation Blog to your attention back in December. These posts discussed the need of formulating a discovery plan before taking depositions.
Here is a related article titled "Mastering the Blind Cross-Examination" written by Mark A. Nuebauer. This article questions the need to depose everyone and provides tips on cross-examining a witness who has not been deposed.
An excerpt: "To be effective, blind cross must have a specific goal. More often than not, each witness in a trial is intended to lay out a specific fact or a set of key facts that help provide the premise for that side’s case. Cross-examination should be a laser beam designed to attack that side’s contention of that fact or set of facts. In short, blind cross-examination should be a stiletto, not a sledge hammer attack."