In general, survival occurs when a unit is active and identifiable both before and after a specific (business) demographic event. The unit may be changed in some way, e.g. in terms of economic activity, size, ownership or location, but there should be continuity of the unit reference number in the statistical business register.
In the Business Demography context, survival occurs if an enterprise is active in terms of employment and/or turnover in the year of birth and the following year(s). Two types of survival can be distinguished:
1) An enterprise born in year xx is considered to have survived in year xx+1 if it is active in terms of turnover and/or employment in any part of year xx+1 (= survival without changes).
2) An enterprise is also considered to have survived if the linked legal unit(s) have ceased to be active, but their activity has been taken over by a new legal unit set up specifically to take over the factors of production of that enterprise (= survival by take-over).
Eurostat and Organization for Economic Cooperation and Development (OECD), "Eurostat - OECD Manual on Business Demography Statistics (Edition 2007)", Methodologies and Working Papers, Office for Official Publications of the European Communities, Luxembourg, 2007