Principle 4 — establish a fair or acceptable level of performance for a task, and then develop a pay system that provides a reward for performance above the acceptable level.

原则4 - - -建立一个公平的或可接受的水平，表现为一个任务，然后制定一个支付系统，提供奖励业绩高于可接受的水平。

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Main task of that system is to track visitors and show how much they must pay.

该系统的主要任务是跟踪游客和展示他们必须支付多少。

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Executives have cited the difficulty of that task as a key reason for the long lead-up to the new pay system and have been testing and debugging the system.

WSJ: New York Times Prepares Plan to Charge for Online Reading