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Engineering

IT System Evaluation

Overview

- How to Evaluate (metrics)
- Requirements
- A list of likely NFRs (loosely defined)
- NFRs and IT Infrastructure
- Overall Performance

- A system is evaluated using
- metrics,
- non-functional attributes,
- What qualitites a system HAS when implemented
- non-functional requirements (NFR).
- What qualities a system SHOULD HAVE as a design goal

- A metric is a general way of measuring some characteristic, with the intention of using such measurements to
- compare competing solutions, or
- change ('optimise') systems in some way in an organised manner.

- Functional:
- Characteristics of the system being designed
- Every system is defined by functional requirements

- Non-functional: ("Qualities")
- Used as a means of comparing multiple systems purporting to do the same thing.
- Allows you to choose.
- Describe the qualitative behavior of a system
- Essential in IT infrastructure architectures

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