This document provides guidance on writing effective test questions for online test engines. It begins with an overview of the topics to be covered, including test engine challenges, writing scenarios and questions, response options, and quality assurance. Specific tips are given for writing one-paragraph scenarios, questions with a single correct answer, and three plausible distractor responses. Strategies are outlined for validating the preferred response and checking for hints. The importance of using plain language and avoiding technical jargon is emphasized. Test writers are encouraged to prototype questions in test engines and get feedback to improve question quality before publishing. The goal is to leave with concrete tools for crafting valid, reliable test questions.