In the fifth step, you check the impact of the implemented measures after a certain period. The period can be chosen according to the needs of your organisation but it should be done regularly (e.g. every year).
In particular, you should monitor the objectives and measures defined in the GEP to see what has been achieved so far, and conduct critical analysis when expected progress has not been achieved to identify appropriate adjustments. These conclusions should be reported in a monitoring report, which will be published internally, within the organisation or externally without detailed figures.