text: **Despite these many data collections**, there are still important data and research deficits that leave 
  room for less unambiguous and more speculative interpretations of the state of OSH.462 The reporting 
  of working conditions in official statistics (administrative data, registry-based data) and voluntary surveys 
  cannot cover all aspects of OSH at workplaces. The accuracy of statistics and surveys fades as more 
  informal and irregular working conditions are prevalent. Work at the edges of legality is surely not a good 
  base for the willingness to respond realistically in interviews or to provide reliable statistical data. Other 
  issues add to this, for example, low participation of migrants in voluntary surveys is reported by many 
  survey providers.463 
  
  These**types of less formalised work**have gained more and more importance in social reality and 
  research. There are some prominent examples of EU-wide overviews. The ‘European Platform for 
  
  European Agency for Safety and Health at Work – EU-OSHA 
  133 