Human factors and ergonomics (HF/E) has a tradition of working with stakeholders and end-users within a participatory approach. Employee/end-user engagement allows for better comprehension of specific nuances and intricate details of the workplace/environment, project context, and interactions between various elements in the system. Employee/end-user engagement allows for solutions and outcomes that are more appropriate, effective and acceptable for the employees/end-users. Engaging employees/end-users and fostering various levels of participation requires consideration of key roles for those involved, assurance that ethical obligations are met, and facilitation/training by HF/E practitioners. Engagement levels can evolve over time, with progression towards sustained capacity for HF/E throughout a project/enterprise. Establishing common HF/E practices, procedures and language across levels of a project/enterprise can be achieved through employee/end-user engagement.