Scale AI transitioned to the project management tool Linear due to its rapid growth and the limitations of its existing tools, which struggled to keep up with increasing demands. Initially using a mix of different tools, Scale's leaders, including Sam Sipe and Clemens Viernickel, recognized the need for a more efficient and user-friendly solution, prompting a grassroots movement within the company to adopt Linear. The transition was driven by the desire for improved clarity, ease of issue tracking, and better workflows, which could support the company's expanding team and product offerings. The migration to Linear led to significant improvements in bug resolution times and overall productivity, as it provided a streamlined platform that employees found enjoyable and effective, ultimately enhancing Scale's capability to drive advancements in AI.