Task Success Rate (TSR)

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Task Success Rate (TSR)

Task Success Rate is a quantitative metric used to measure the effectiveness of a system, product, or service in enabling users to complete a specified task successfully.

It is commonly applied in usability testing, human-computer interaction (HCI), customer support, and automated systems evaluation.

Task Success Rate is defined as the percentage of attempts in which users complete a predefined task correctly and completely within a given context or conditions.

What is Task Success Rate?

Binary Outcomes

Each task attempt is classified as either successful or unsuccessful, with no partial credit.

Predefined Criteria

Success is measured against clearly defined criteria or goals for the task.

Contextual Limits

The task and conditions (environment, tools, time limits) are explicitly specified.

Aggregated Measuring

Calculated over multiple users or tests to produce a representative success rate.

How are TSR Metrics Used?

Usability Testing

Evaluate user interfaces by determining if users can complete tasks such as form submission, navigation, or data retrieval.

Automated Systems

Measure if an AI, chatbot, or automation completes user requests correctly.

Customer Service

Track the rate at which customer queries are resolved successfully.

Quality Assurance

Benchmark performance before and after system changes.

How is TSR Data Collected?

• Direct observation of users performing tasks
• System logs indicating completion status
• Self-reports or questionnaires confirming task outcomes

Task Success Rate is a fundamental metric for objectively measuring the proportion of users or attempts that successfully complete a specific task, providing clear insight into system or process effectiveness.

What is the Formula for Task Success Rate?

How to Calculate Task Success Rate: