This document discusses factors to consider when drafting a letter of engagement for legal clients. It emphasizes the importance of clearly outlining payment policies, including retainer amounts, billing schedules, credit card fees, and consequences for non-payment. The letter should also specify who is responsible for fees, payment timelines, and the use of electronic billing platforms. Defining work-in-progress and unbilled time policies can help law firms improve their realization rates and reduce write-offs. Selecting appropriate key performance indicators to measure utilization, realization, and other metrics can enhance a firm's profitability.