A subsystem description is a system object that contains information defining the characteristics of an operating environment controlled by the system.<ref>IBM's definition @ http://www.ibm.com/support/knowledgecenter/ssw_i5_54/rzaks/rzakssbsd.htm</ref> The Data tests are performed to verify the correctness of the individual subsystem configuration data (e.g. MA Length, Static Speed Profile, …) and they are related to a single subsystem in order to test its Specific Application (SA).<ref>{{Cite book|title=European Committee for Electrotechnical Standardization (CENELEC) - EN 50128|last=|first=|publisher=CENELEC|year=2011|isbn=|location=Brussels, Belgium|pages=Table A.11 – Data Préparation Techniques (8.4)}}</ref> | A subsystem description is a system object that contains information defining the characteristics of an operating environment controlled by the system.<ref>IBM's definition @ http://www.ibm.com/support/knowledgecenter/ssw_i5_54/rzaks/rzakssbsd.htm</ref> The Data tests are performed to verify the correctness of the individual subsystem configuration data (e.g. MA Length, Static Speed Profile, …) and they are related to a single subsystem in order to test its Specific Application (SA).<ref>{{Cite book|title=European Committee for Electrotechnical Standardization (CENELEC) - EN 50128|last=|first=|publisher=CENELEC|year=2011|isbn=|location=Brussels, Belgium|pages=Table A.11 – Data Préparation Techniques (8.4)}}</ref> |