d924f03e_sselaer_Data_Warehouse_Project__data_warehousing_systems
[operational systems] Operational systems generally require a non-trivial level of computing skills amongst the end-user community. [data warehousing systems] 
Data warehousing systems generally appeal to an end-user community with a wide range of computing skills, from novice to expert users.
Operational Systems vs. Data Warehousing - Rensselaer Data Warehouse Project
data warehousing systems