Introduction to Code Inspections
A code inspection originally introduced by Fagan at IBM is similar to a walk through but is more formal. In an inspection, the review team checks the code and documentation against a prepared list of concerns. For example the team may examine the definition and use of data types and structures to see if their use is consistent with the design and with system standards and procedures. The team can review algorithms and computations for their correctness and efficiency. Comments can be compared wide code to ensure that they are accurate and complete. Similarly the interfaces among components can be checked for correctness. The team may even estimate the code performance characteristics in terms of memory usage or processing speed in preparation for assessing compliance with performance requirements. Inspection code usually involves some steps given as:
(a) The team may meet as a group for an overview of the code and a description of the inspection goals.
(b) Then team members prepare individually for a second group meeting. Each inspector studies the code and its related documents noting faults found.
(c) Finally in a group meeting team members report that they have found recording additional faults discovered in the process of discussing individual findings. Sometimes faults discovered by an individual are considered t be false positives items that seemed to be faults but in fact were not considered by the group to be true problem.
Inspection team members are chosen based on the inspection goals sometime a particular team member will have more than one role. For example it the inspection in intended to verify that the interfaces are correct then the team should include interface designers. Because the goal is focus of the inspection a team moderators not the programmers is the meeting leader using a set of key questions to be answered. As with walk through inspections criticize the code, not the coder, and the results are not reflected in a performance evaluation.
In addition to defects there are quality issue which the review also addresses. The first is efficiency, a modules may be implemented in an obviously inefficient manner and could be wasteful of memory or the computer time. The code could also be violating the local coding standards. Although non adherence to coding standards cannot be classified as a defect, it is desirable to maintain the standard. Standard can have restriction on annotations internal documentation, use of global variable use of recursion naming of variables maximum nesting of loops and alternative constructs.
To follow such standards of code R. H Dunn has provided a checklist for code reviews. The followings are some of the items that can be included in a checklist for code reviews:
These are some of the items of checklist for code reviews provided by Dunn.
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