Another key player in the field of data
warehousing is Ralph Kimball. In 1996 Kimball
publish his first book about data warehouse titled
The Data Warehouse Tool Kit. This book covers
industry-oriented, practical examples for OLAPstyle
modeling of Data Warehouse [11]. Kimball is
an advocate of multidimensional approach of
building data warehouse. Contrary to Inmon,
Kimball view data warehouse as a collection of
departmental individual data marts, integrated
together to form the data warehouse. His
methodology indicates bottom up approach to
building data warehouse in which autonomous data
marts for each department are firstly built and later
combined into a larger data warehouse [10].
Moreover, according to Kimball DW can described
as a decision support tool that obtain its data from
various heterogeneous sources and transform it into
meaningful information for decision making [5,
10].