For this research, it is necessary to follow companies for a longer period or even continuously. You will then receive the same questionnaire for a number of months or quarters. In this survey, a number of companies are 'refreshed' each year. This means that some of the companies do not return to the new sample. Other companies will then be contacted instead. This change takes place mainly among small and medium-sized businesses. How long your company is part of the survey is therefore not known in advance.