Programmes that aim to contributing to decent work, do so through a variety of activities, targeting different groups and stakeholders while aiming for very different outcomes. Therefore, measurement of the success and progress of such activities should follow the logic of these activities. When a programme departs from a decent work deficits analysis (see related FAQ), monitoring should keep track of the extent to which such deficits have been overcome. Achieving decent work, however, is expected to lead to a whole range of positive impacts for those concerned and the society at large, such as reducing inequality and empowerment, and measurement should thus follow suit.
As such, what measurement approach and tools to use is highly dependent on the programme. The toolbox suggests making use of the Decent Work Check which was developed by the Wage Indicator Foundation, you can find that section and associated tools here.