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| Dimensional layer | Indicator layer | Item |
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| Reliability | Fluency | Short response time, fast running speed |
| No time lag |
| Availability | Get the information and experience needed from free resources and services |
| Charge service is cost-effective |
| System performance | Strong compatibility and configuration of the equipment system |
| Small package, high memory usage |
| Stability | Little flashback, low error rate |
| Timely access to specific usage scenarios, problem detection, and vulnerability repair |
| Low memory crash rate |
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| Usefulness | Content richness | Abundance and variety of reading resources available |
| Information quality | High quality of books or articles through screen reading resources |
| Original and innovative articles |
| Timeliness | Articles on current events |
| The high renewal rate of books and the fast update rate of mobile reading information resources |
| Integrity | Coverage area containing personal center, reading, learning, socializing, and book shopping |
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| Thoughtfulness | Personalized service | Content delivery based on user preferences |
| Automatic classification of content users viewed |
| Novel personal center setting such as reminder, inventory, and other service functions |
| Convenience | Retrieve and access information easily and quickly |
| Save browsed articles or books for long period of time and access content that have been read before easily |
| Provision of reminder services to enable users to clean up buffer files in a timely manner |
| Rich reading function | Catalog and bookmark |
| Provision of night mode, brightness adjustment, magnifying glass, reading interface adapting to mobile phone interface, setting font size, page turning mode simulation, and other functions to improve the real-time reading experience |
| Notes are in a variety of forms, such as rapid tagging and query |
| Sharing functions such as one-click images or links |
| Advertising | Little advertisement push |
| No malicious advertising |
| No bundled software |
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| Interactivity | Interface design | Reasonable layout of the content plate and the logical operation. Conspicuous position of “search,”“rank,” and other options, and clear browsing experience |
| Icon design full of personality, good typography |
| Interface colors coordination and strong sense of aesthetics |
| Interpersonal interactions | The community supports the initiation of topics and activities, and they can be classified |
| Community sharing services such as forwarding, commenting, and rewarding |
| Meeting the needs of users to make friends, follow others, and chat |
| Supervision and management system for community content, such as sensitive words restriction, etc. |
| Feedback system | Various user feedback channels, such as official mailboxes, feedback centers, and questionnaire regularly sent for comments |
| Reporting function, timely handling of reporting information |
| Timely handling of problems when software background receives the feedback |
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| Security | Privacy protection | Protection of users’ related personal information |
| Protection of users’ browsing records, articles or books collected, books purchased, and other information which can be seen privately |
| Copyright protection | Strict regulations on reproduction and citation of original articles |
| Emphasis on copyright on relevant pages |
| Payment security | A refund guarantee for users to purchase books and peripheral products |
| Protection of passwords and data during payment |
| Provision of a variety of reliable payment channels, such as Alipay, WeChat, or bank cards |
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| Compatibility | Behavioral fit | The degree to which the software settings are consistent with the users’ own usage or reading habits |
| Value fit | The degree to which the users’ perceived content matches their expectations |
| The degree to which the users’ perceived services matches their expectations |
| Continuity of use | Users’ using time and frequency |
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