System Quality Improvement Including Software and Infrastructure Based on Software Metrics Approach

We propose a basic metric for design sheets of infrastructure in order to improve infrastructure quality. The metric is called as LOI (Line Of Item). LOI is a simple metric of infrastructure for measuring scale and quality of infrastructure, as same as LOC (Line Of Code) of software. In addition, a class diagram of design sheets is provided in UML software design technique. LOI and the class diagram are applied to a real large-scale project. As a result, the whole of structure of the design sheets was clear, and, the scale of the infrastructure was able to be measured. In addition, the 40 system faults caused by the design sheets are analyzed. Correlation coefficient between LOI and the system faults was 0.483, it is weak correlation. Moreover, we confirmed that omission of design sheets such as blank columns may cause system faults, and copy actions of sub-design sheets may lead system faults.