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Message: [QUOTE="leonardo77, post: 2514428"] Alf P. Steinbach: To my perception Cy Edmunds might be correct at this point. Protected data is frowned upon for the same reason as public data. (It's even worse,there are in fact some possible uses of public data, aka. bag of bits or std::pair). Derived classes are as coupled to the protected data/interface of their base classes as the rest of the world to the public data/interface. as the rest of the world. Still,if the application is reasonably small or you can control the changes,you can just stick to protected data to avoid complications. [/QUOTE]