This study describes the four-phase process used in developing the "Employer Openness Survey" (EOS). The EOS is an 18-item instrument designed to measure the openness of employers to hiring, accommodating, and promoting workers with disabilities. During the first phase, the authors generated potential questions and pilot-tested them with employers. They then evaluated scoring criteria and construct validity in the second phase. In the third phase, the EOS was field-tested with employers, scoring criteria were finalized, and interrater reliability was established. In the fourth phase, they presented the EOS to placement professionals who evaluated the clarity and usefulness of the instrument for practitioners in the field. Results of this study provide initial support for the EOS and confirmation of its usefulness for rehabilitation counselors providing placement services.