ISO 9421 says that the usability of something should be measured in terms of it's effectiveness, efficiency and satisfaction.

在ISO 9421里提到，某一事物的可用性应当可以以效力(effectiveness)、效率(efficiency)和满意度(satisfaction)三个维度来进行衡量。

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Properly insulating your attic and sealing any leaks under doors or around windows, will greatly improve the effectiveness & efficiency of your both cooling AND heating systems.

将顶层阁楼与下面的房子进行隔热，将门窗漏风处都堵好，如果这些措施得当，将会大大地提高空调制冷与制热系统的工作效率。

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The ISO 9241 standard defines website usability as the “effectiveness, efficiency and satisfaction with which specified users achieve specified goals in particular environments.

ISO 9241标准中对网站可用性的定义是：特定用户在特定环境下，能够快速、有效且满意地完成特定的目标。

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Once upon a time in industry and government, bigness was synonymous with effectiveness and efficiency.

FORBES: Fact and Comment

Brussels is especially concerned about the effectiveness and efficiency of much of Italian public spending.

ECONOMIST: Italy��s troubled economy

"TSA has strict requirements that all vendors must meet for security effectiveness and efficiency, " the agency said in a statement.

BBC: TSA to phase out Rapiscan 'naked scanners'