ISO 45001: Worker involvement in improvement

Answer:
Clause 5.4 d, 9 requires that you consult non-managerial workers on continual improvement of the OHSMS. This entire clause is based on the fact that workers are the most immediate interested parties within your OHSMS as they are directly affected by your efforts to improve OH&S within the workplace. Additionally, continual improvement and involvement of people are two of the main principles behind all of the ISO management system standards, and the best way to identify improvement within the processes is through the use of the people involved.
This requirement is pointing to the need to have workers involved in making the OHSMS better within your company to improve the processes and reduce the incidences of injury or ill health.

For a better understanding of the worker participation and consultation requirements, see the article: How to meet participation and consultation requirements in ISO 45001, https://advisera.com/45001academy/blog/2016/03/16/how-to-meet-participation-and-consultation-requirements-in-iso-45001/