[Data Retrieval] table, index [Information Retrieval] table, index [Knowledge Retrieval] knowledge unit, knowledge structure [0] 
Organization
M a t c h
I n f e r e n c e
M o d e l
Q u e r y
O r g a n i z a t i o n
R e p r e s e n t a t i o n
S t o r a g e
R e t r i e v e d R e s u l t s