Information Technology Reference
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2.4.2 System Development Phases
Figure 2.5 shows how the analysis, design, and preliminary construction stages are
repeated for a data warehousing project, assuming that the subsystems include a
staging area, the warehouse data repository, and an information delivery system.
The work on each subsystem is a phase.
2.4.3 Software Testing in the Stages
Some kind of software testing is normally performed in every development phase
except Installation. The Preliminary INVESTIGATION, Analysis, and Design
phases are “paper and pencil'' exercises because all of these phase results are docu-
ments. No code is written in these phases, so no test executions can be performed.
Preliminary
investigation
stage
Staging area module
Warehouse data
repository module
Information delivery
module
Analysis stage
Analysis stage
Analysis stage
Design stage
Design stage
Design stage
Preliminary
construction
stage
Preliminary
construction
stage
Preliminary
construction
stage
Final
construction
stage
Installation
stage
Figure 2.5
PDM phases of a data warehousing project
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