Content for G-TELP tests is initially created by writing and assessment specialists from the United States and around the world. In creating test items, writers draw from a comprehensive manual that outlines each component of the test in detail, with examples. Guidelines specify not only how to construct different types of content, but also how to identify suitable topic choices and maintain consistency in tone, vocabulary difficulty, and readability.

Early drafts of test content are reviewed by in-house editors, who provide extensive feedback to writers and request any necessary adjustments. Once writers have returned drafts to the editors, the content is prepared for the first stage of editing.

A team of in-house editors reviews the content and begins a discussion about potential issues that warrant revision. It is not until the entire team has conducted an extensive review of the materials and agreed upon revisions that the content moves to the next stage.

In this stage, each editor assigned to the content individually rates all items for difficulty based on an established set of guidelines. Differences are resolved through a joint ratings session, during which further revision is made to the content to guarantee that every test has an equal distribution of items at each difficulty level.

Assessment experts—both in-house and external reviewers—are asked to mimic the test taker's experience by answering all test questions, while providing feedback about various aspects of the test as they go. Feedback may include comments about aspects such as item functionality, potential bias, overall accessibility, and consistency across tests. Although there are established guidelines for approaching this task, reviewers are invited to share any feedback they feel might lead to the improvement of the test content. Reviewers’ comments are then sent to the team of collaborating editors, who discuss the feedback and revise the content accordingly.

Materials are sent to an external group of usability testers who share demographic characteristics with the target population. Once they complete the test, results are sent back to the editing team, who use the responses to identify any potentially problematic items. Necessary revisions are then made to the content.

A new group of assessment experts, professors from various universities across the United States, review the content and identify any late-stage concerns, primarily with the overall functionality and fairness of the test. The editing team then uses that feedback to make final revisions, if necessary.

Each of the editors assigned to the test conducts a careful final review. The editors then meet to discuss any issues that arise during proofreading and the test content is finalized.