Important quality indicators of interactive IT products
Availability is the probability or expected value of time occupancy that the system can operate normally at a certain inspection time.The inspection time is the specified instant, which is called instantaneous availability;When the inspection time is a specified period, it is called period availability;The inspection time is any time during continuous use, which is called inherent availability.It measures the actual use efficiency of equipment after it is put into use, and it is a comprehensive characteristic of reliability, maintainability and maintenance support of equipment or system.
Chinese name
usability
Foreign name
Availability
Genus
Interactive IT productsImportant quality indicators of
Definition
Whether the user can use the product to complete his task
usabilityyesInteractive IT products/The important quality indicators of the system refer to the degree to which the product is effective, easy to learn, efficient, easy to remember, error free and satisfactory to users, that is, whether users can use the product to complete their tasks, how efficient it is, and how subjective it is. In fact, it is the product quality seen from the perspective of usersProduct competitivenessThe core of.
Meaning of availability
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In the mid-1980s, the slogan of "user friendly" appeared, which was converted into the concept of "usability" of human-computer interface.There are many definitions of usability:
The definition in ISO9241/11 is:The extent to which a product can be used by specified users to achieve specified goals with effectiveness,efficiency and satisfaction in a specified context of use.)。
GB/T3187-97 Definition of Availability:On the premise that the required external resources are guaranteed, the ability of the product to be in the state of performing the specified functions under the specified conditions and at the specified time or time interval.It is a comprehensive reflection of product reliability, maintainability and maintenance supportability。
In fact, Shakel (1991) commonly defines usability: usability refers to the "ability (according to the functional characteristics of people) of technology, which can easily and effectively be used by a specific range of users. After specific training and user support, it can complete a specific range of tasks in a specific environment."
This definition includes several meanings.First, usability involves not only the design of the interface, but also the technical level of the whole system.Second, usability is reflected by human factors and evaluated by users operating various tasks.Third, environmental factors must be taken into account. In different fields, the evaluation parameters and indicators are different, and there is no universally applicable evaluation standard.For example, computers on the plane, financial management, children at home, online teaching, experts and new usersdata processingAnd mapping, their availability parameters and indicators are different.Therefore, usability testing emphasizes the importance of factors during the environment, often including user types, specific tasks, operating environment, etc.At that time, few people analyzed the meaning of usability from the perspective of user operation psychology, so they did not propose appropriate content.Fourth, abnormal operation shall be considered.For example, operations under specific circumstances such as user fatigue, distraction, urgent tasks, and multitasking.Generally speaking, usability is expressed as "user-friendly", "intuitive", "easy to use", "no need for long-term training", "no brain", etc.
Basic meaning
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fromPsychologyFrom the perspective of availability, the basic meaning is:
1. The software design enables users to focus their perception and thinking on their own tasks, operate according to their own action process, and do not have to be distracted by looking for menus or understanding of human-computer interfacesoftware structure The structure of human-computer interface and the meaning of icons do not need to be distracted by how to transform their own tasks into computer input methods and processes;
2. Users do not have to remember the knowledge of computer hardware and software;
3. Users do not need to be distracted by manual operation, and the operation is simple and repeated;
4. Users can still operate normally in abnormal environments and scenarios;
5. Less user understanding and operation errors;
6. The user's learning time is short.
notes
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Including:
Effectiveness - the degree of correctness and integrity of users when completing specific tasks and achieving specific goals;
Efficiency - the ratio between the correctness and completeness of the task completed by the user and the resources used (such as time);
Satisfaction - the degree of subjective satisfaction and acceptance of users in the process of using products.
