The International Organization for Standardization (ISO) defines usability under the standard ISO 9241-11 as "The extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use."

1. Effectiveness: This refers to the accuracy and completeness with which users can achieve their goals in a particular environment. It's about whether users can complete their tasks, how many errors they make, and how severe these errors are.

2. Efficiency: This refers to the resources that have been expended in relation to the accuracy and completeness of the goals achieved. It's about how quickly these tasks can be completed once the user has learned how to use the product.

3. Satisfaction: This refers to the comfort and acceptability of the work system to its users and other people affected by its use. It's about how satisfied users are with the process of achieving their goals using the product.

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The International Organization for Standardization (ISO) defines usability under the standard ISO 9241-11 as "The extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use."

1. Effectiveness: This refers to the accuracy and completeness with which users can achieve their goals in a particular environment. It's about whether users can complete their tasks, how many errors they make, and how severe these errors are.

2. Efficiency: This refers to the resources that have been expended in relation to the accuracy and completeness of the goals achieved. It's about how quickly these tasks can be completed once the user has learned how to use the product.

3. Satisfaction: This refers to the comfort and acceptability of the work system to its users and other people affected by its use. It's about how satisfied users are with the process of achieving their goals using the product.

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The International Organization for Standardization (ISO) defines usability under the standard ISO 9241-11 as "The extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use."

1. Effectiveness: This refers to the accuracy and completeness with which users can achieve their goals in a particular environment. It's about whether users can complete their tasks, how many errors they make, and how severe these errors are.

2. Efficiency: This refers to the resources that have been expended in relation to the accuracy and completeness of the goals achieved. It's about how quickly these tasks can be completed once the user has learned how to use the product.

3. Satisfaction: This refers to the comfort and acceptability of the work system to its users and other people affected by its use. It's about how satisfied users are with the process of achieving their goals using the product.

What are the three main measures of usability in the ISO definition?

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