Employers have a duty to be proactive in designing workplace policies and standards in a way that does not discriminate in the first place. But when a situation arises where a worker needs accommodation in order to perform his/her duties or participate fully in the workplace,
Workers have an obligation to advise the employer of the accommodations they may require.
The worker must show that he or she has a disability (or has a religious practice or family responsibilities, etc) that require accommodation. Without the accommodation, there are barriers for the worker who is unable to fully participate and/or to have access to benefits and opportunities that other have in the workplace. The employer is then obligated to remove the barriers through accommodation of the worker.