Usability measurement and metrics: A consolidated model
Ahmed Seffah · Mohammad Donyaee · Rex B. Kline ·Harkirat K. Padda 2006

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Several studies have reported the benefits of a strong commitment to usability in the software development lifecycle.
Several different standards or models for quantifying and assessing usability have been proposed within the Human-Computer Interaction (HCI) and the Software Engineering (SE) communities. Examples of the latter include the ISO/IEC 9126-1 (2001) standard, which identifies usability as one of six different software quality attributes; the ISO 9241-11 (1998) standard, which defines usability in terms of efficiency, effectiveness, user satisfaction, and whether specific goals can be achieved in a specified context of use; and Directive 90/270/EEC of the Council of the European Union (1990) on minimum safety and health requirements for work with computers.
Motivations for a consolidated model for usability measurement are to:
1. Reduce the cost of usability testing.
2. Complement more subjective evaluations.
3. Help in comminication of usability measurement.
4.Promote good usability measurement practises.

This paper evaluates the existing usability measurement standards or models very well and this could be done in our literature review:
1 Usability in ISO standards related to HCI
2 Usability in traditional software quality models
3. Other specific measurement models

The paper gives three main reasons for a consolidated model:
1. The hierarchical quality models has some common limitations
2. Most of the software quality models are static
3. It can be rather difficult to apply usability standards in practice, that is, to decide exactly how to measure the usability of a particular application

This paper proposes QUIM (Quality in Use Integrated Measurement) as a consolidated model for usability measurement. Quim consists of several aspects including:
1. User model, context of use and usability in context
2. Usability factors(which is divided into ten factors
3. Measurable criteria
4. Metrics

Some uses of quim would would be: 1. Gives consistent definitions of usability factors, criteria, and metrics; and 2. Maps the hierarchical relations among them. It is also intended to serve as a guide in planning for usability measurement.
They developed aq "quim editor" program to support the uses described in this paper.