# STEP 8: Measure Defect Escape Rate

The **Defect Escape Rate** is your key to **unlocking real quality improvement**. Let's explore how to use it:

#### **Got historical data?**

* Track your progress! Compare Defect Escape Rate from **release to release** to see the impact of SeaLights' new processes.

#### **Starting fresh?**

* No worries! Begin measuring **after your first SeaLights release**.
* Make it a habit: track **monthly or on your preferred schedule**.

#### **Analyzing Progress:**

* A **decreasing Defect Escape Rate** signifies **quality improvement**.
* **No significant change?** Let's dig deeper:
  * **Unaddressed Test Gaps:** Escaping defects may be linked to the test gaps you chose not to address.
  * **Low Quality Threshold:** Is your bar set too low, letting defects slip through?
  * **Test Strategy Optimization:** Focus on component tests? Time for more integration or end-to-end tests!

{% hint style="info" %}
Combine the Defect Escape Rate with other quality metrics for a holistic view.
{% endhint %}


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