What are the characteristics of an effective user interface?

一个有价值的用户界面应该具有那些特性？

youdao

From the Linux man pages: setuid sets the effective user id of the current process.

在Linux手册页上指出：setuid设置当前进程的有效用户id。

youdao

Sem_perm.cuid and sem_perm.uid are set to the effective user id of the calling process.

sem_perm . cuid和sem_perm . uid被设置为调用进程的有效用户id。

youdao

They are working to build a simple and effective user interface for both the account holder and the people booking time with him or her, which is a differentiator in this industry itself.

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BBC's online services were found to deliver high quality material in an effective and user-friendly manner.

BBC: At a glance: The Graf Report

"I am a great skeptic that anything offered by mobile-phone devices will ever be as effective, user-friendly or as cheap, " he says.

FORBES: Proving Papa Wrong