Functional suitability	degree to which a product or system provides functions that meet stated and implied needs when used under specified conditions
Functional completeness	degree to which the set of functions covers all the specified tasks and user objectives
Functional correctness	degree to which a product or system provides the correct results with the needed degree of precision
Functional appropriateness	degree to which the functions facilitate the accomplishment of specified tasks and objectives
Reliability	degree to which a system, product or component performs specified functions under specified conditions for a specified period
Maturity	degree to which a system, product or component meets needs for reliability under normal operation
Availability	degree to which a system, product or component is operational and accessible when required for use
Fault tolerance	degree to which a system, product or component operates as intended despite the presence of hardware or software faults
Recoverability	degree to which, in the event of an interruption or a failure, a product or system can recover the data directly affected and re-establish the desired state of the system
Performance efficiency	performance relative to the amount of resources used under stated conditions
Time behavior	degree to which the response and processing times and throughput rates of a product or system, when performing its functions, meet requirements
Resource utilization	degree to which the amounts and types of resources used by a product or system, when performing its functions, meet requirements
Capacity	degree to which the maximum limits of a product or system parameter meet requirements
Usability	degree to which a product or system can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use
Appropriateness recognizability	degree to which users can recognize whether a product or system is appropriate for their needs
Learnability	degree to which a product or system can be used by specified users to achieve specified goals of learning to use the product or system with effectiveness, efficiency, freedom from risk and satisfaction in a specified context of use
Operability	degree to which a product or system has attributes that make it easy to operate and control
User error protection	degree to which a system protects users against making errors
User interface aesthetics	degree to which a user interface enables pleasing and satisfying interaction for the user
Accessibility	degree to which a product or system can be used by people with the widest range of characteristics and capabilities to achieve a specified goal in a specified context of use
Maintainability	degree of effectiveness and efficiency with which a product or system can be modified by the intended maintainers
Modularity	degree to which a system or computer program is composed of discrete components such that a change to one component has minimal impact on other components
Reusability	degree to which an asset can be used in more than one system, or in building other assets
Analyzability	degree of effectiveness and efficiency with which it is possible to assess the impact on a product or system of an intended change to one or more of its parts, or to diagnose a product for deficiencies or causes of failures, or to identify parts to be modified
Modifiability	degree to which a product or system can be effectively and efficiently modified without introducing defects or degrading existing product quality
Testability	degree of effectiveness and efficiency with which test criteria can be established for a system, product or component and tests can be performed to determine whether those criteria have been met
Security	degree to which a product or system protects information and data so that persons or other products or systems have the degree of data access appropriate to their types and levels of authorization
Confidentiality	degree to which a product or system ensures that data are accessible only to those authorized to have access
Integrity	degree to which a system, product or component prevents unauthorized access to, or modification of, computer programs or data
Non-repudiation	degree to which actions or events can be proven to have taken place, so that the events or actions cannot be repudiated later
Accountability	degree to which the actions of an entity can be traced uniquely to the entity
Authenticity	degree to which the identity of a subject or resource can be proved to be the one claimed
Compatibility	degree to which a product, system or component can exchange information with other products, systems or components, and/or perform its required functions, while sharing the same hardware or software environment
Co-existence	degree to which a product can perform its required functions efficiently while sharing a common environment and resources with other products, without detrimental impact on any other product
Interoperability	degree to which two or more systems, products or components can exchange information and use the information that has been exchanged
Portability	degree of effectiveness and efficiency with which a system, product or component can be transferred from one hardware, software or other operational or usage environment to another
Adaptability	degree to which a product or system can effectively and efficiently be adapted for different or evolving hardware, software or other operational or usage environments
Installability	degree of effectiveness and efficiency with which a product or system can be successfully installed and/or uninstalled in a specified environment
Replaceability	degree to which a product can replace another specified software product for the same purpose in the same environment
Cost	Denotes the amount of money that a company spends on the creation or production of goods or services.
Implementation Cost	Estimation of implementation costs based on similar past experiences.
Complexity	Complexity characterises the behaviour of a system or model whose components interact in multiple ways and follow local rules, meaning there is no reasonable higher instruction to define the various possible interactions.
Flexibility	it normally refers to the ability for the solution to adapt to possible or future changes in its requirements.
Development Effort	the process of predicting the most realistic amount of effort required to develop or maintain software based on incomplete, uncertain and noisy input.
Implementability	degree to determine how easily a software product can be implemented.
Extensibility	Extensibility is a software engineering and systems design principle where the implementation takes future growth into consideration. The term extensibility can also be seen as a systemic measure of the ability to extend a system and the level of effort required to implement the extension.
Configurability	Highly configurable software provides adaptable and flexible solutions to complex, real world problems for the ever changing information technology environment
Ease of deployment	minimal effort to install and run an application.
Ease of development	ease of coding and developing
Scalability	Scalability is the capability of a system, network, or process to handle a growing amount of work, or its potential to be enlarged to accommodate that growth.
Integrability	Integrability evaluation refers to testing if separately developed components work correctly together.
Evolvability	a system's ability to survive changes in its environment, requirements and implementation technologies
Variability	the ability of software systems or artifacts to be adjusted for different contexts
Traceability	the degree to which a relationship can be established between two or more products of the development process, especially products having a predecessor-successor or master-subordinate relationship to one another;
(Un)pluggability	the degree to reusability of a component
Understandability	Understandability is defined as the attributes of software that bear on the users' efforts for recognizing the logical concept and its applicability.
Latency	Latency is a time interval between the stimulation and response, or, from a more general point of view, a time delay between the cause and the effect of some physical change in the system being observed.
applicability	the quality of being relevant or appropriate.
Consistency	consistent behaviour or treatment, the way in which a substance holds together
manageability	How efficiently and easily a software system can be monitored and maintained to keep the system performing, secure, and running smoothly.
Durability	software durability means the solution ability of serviceability of software and to meet user's needs for a relatively long time. For a software security to be durable, it must allow an organization to adjust the software to business needs that are constantly evolving, often in impulsive ways.
feasibility	Feasibility is defined as the practical extent to which a project can be performed successfully.
Exchangeability	capable of being exchanged for another or for something else that is equivalent.
Discoverability	discoverability refers to the ability of a consumer to find a product at the time when they have a need for it.
Composability	Composability is a system design principle that deals with the inter-relationships of components. A highly composable system provides components that can be selected and assembled in various combinations to satisfy specific user requirements.
Heterogeneity	Heterogeneity in software engineering is usually referring to the composition of a software system. A heterogeneous system is one that is made up of software that could be written in different languages, running on different operating systems, perhaps use different standards for communication.
Evolution	Software evolution is the term used in software engineering (specifically software maintenance) to refer to the process of developing software initially, then repeatedly updating it for various reasons.
Throughput	Throughput is a measure of how many units of information a system can process in a given amount of time. It is applied broadly to systems ranging from various aspects of computer and network systems to organizations.
Response time	Response Time measures the performance of an individual transaction or query. Response time is the amount of time from the moment that a user sends a request until the time that the application indicates that the request has completed.