ISO/IEC 25010

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 common environment and resources. This characteristic is composed of the following sub-characteristics:

• 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 a system, product or component can exchange information with other products and mutually use the information that has been exchanged.

Degree to which a product or system can be interacted with by specified users to exchange information ia the user interfaceto complete specific tasks in a variety of contexts of use. This characteristic is composed of the following sub-characteristics:

• Appropriateness recognizability - Degree to which users can recognize whether a product or system is appropriate for their needs.
• Learnability - Degree to which the functions of a product or system can be learnt to be used by specified users within a specified amount of time.
• 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 prevents users against operation errors.
• User engagement - Degree to which a user interface presents functions and information in an inviting and motivating manner encouraging continued interaction.
• Inclusivity - Degree to which a product or system can be used by people of various backgrounds (such as people of various ages, abilities, cultures, ethnicities, languages, genders, economic situations, etc.).
• User assistance - Degree to which a product can be used by people with the widest range of characteristics and capabilities to achieve specified goals in a specified context of use.
• Self-descriptiveness - Degree to wich a product presents appropriate information, where needed by the user, to make its capabilities and use immediately obvious to the user without excessive interactions with a product or other resources (such as user documentation, help desks or other users).

Degree to which a system, product or component performs specified functions under specified conditions for a specified period of time. This characteristic is composed of the following sub-characteristics:

• Faultlessness - Degree to which a system, product or component performs specified functions without fault 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.

Degree to which a product or system defends against attack patterns by malicious actos and 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. This characteristic is composed of the following sub-characteristics:

• 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 ensures that the state of its system and data are protected from unauthorized modification or deletion either by malicious action or computer error.
• 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.
• Resistance - Degree to which the product or system sustains operations while under attack from a malicious actor.

This characteristic represents the degree of effectiveness and efficiency with which a product or system can be modified to improve it, correct it or adapt it to changes in environment, and in requirements. This characteristic is composed of the following sub-characteristics:

• 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 a product can be used as an asset in more than one system, or in building other assets.
• Analysability - 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, 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.