1. When assessing whether female and male workers are carrying out the same work or work of equal value, the assessment of whether workers are in a comparable situation shall not be limited to situations in which female and male workers work for the same employer, but shall be extended to a single source establishing the pay conditions. A single source shall exist where it stipulates the elements of pay relevant for the comparison of workers.
2. The assessment of whether workers are in a comparable situation shall not be limited to workers who are employed at the same time as the worker concerned.
3. Where no real comparator can be established, any other evidence may be used to prove alleged pay discrimination, including statistics or a comparison of how a worker would be treated in a comparable situation.