A good Word press plugin must have the following characteristics:
Seamless installation: The plugin must be able to install easily and seamlessly without any trouble. A plugin is as good as it can be installed into the system, if anyone finds the installation to be very complicated; there is a chance that he/she would not use the system at all. Many WordPress plugins are very good as far as features go, but are bad in installation.
A good un-installation process: This is as important as installation itself. Removal of the software should not in any ways impede the operation of the rest of the system. A good plugin should make sure that it stays independent of the rest of the system and does its work seamlessly without trying to alter anything else that can cause the system to fail.
Easy upgrade process: A good plugin must have a good upgrade process, a plugin must be able to adapt to situations and when a new feature can be added, it should be added without altering the whole system. Updates are required for all kinds of software, it is even more important for a software component such as a plugin.
Language support: Good plugins always has options for other languages apart from English. Localization of a plugin is an important thing. People from many demographics use the WordPress software as Content Management System and Blogging system. A language is very important in both cases because not all end-users would know English and it is the duty of the administrator to make sure that the content is readable by most users.
User Understandable errors: A good plugin must throw exceptions and errors that are understood by the end user to rectify and correct it if possible. Errors can be a very big problem if it is untraceable. There must be a system by which the administrator should be able to contact the developer to get all the details without actually getting confused or giving misinformation.
Import/ Export control options: Import and export controls are very much required for a plugin, it makes sure that the administrator can shift or transport the whole architecture of the system to another framework, without needing to make any large changes. It also helps in migration and upgrading of the system.
Great looking user interface: A good user interface is very important to make sure that the administrator is able to understand and work in the plugin.
Security of the system: Plugins have to be less vulnerable to attacks and make sure that an attack is not initiated on the system though the plugin. This is a very big concern and good plugins have good security features.
Keep track of changes: A good plugin must be able to keep track of the changes to the plugin and update when necessary.
Good support: A plugin that is well supported and documented is a big plus.
The above mentioned are the most important characteristics of a WordPress plugin.
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