# Tolerances in the ViDi Tools

Each of the ViDi tools have a tolerance that can be adjusted, which allows the tool to be "picky" in its predictions.

| Blue Read Tool | Blue Locate Tool | Green Classify Tool | Red Analyze Tool
--- | --- | --- | --- | ---
Where to adjust | Feature location Feature score Match data | Feature location Feature score Match data | Match scores | Defect area Score
What's being adjusted | Feature Score | Feature Score | Class Score | Defect Probability

In addition, you can adjust each tool's Threshold parameter (which is one of the Processing Tool Parameters).

Changing the Threshold parameter affects Recall and Precision in the following ways:

Threshold | Recall | Precision
--- | --- | ---
Lowering the Threshold | Increases | Decreases
Increasing the Threshold | Decreases | Increases

Changing the Threshold parameter affects False Positives and False Negatives in the following ways:

Threshold | False Positives | False Negatives
--- | --- | ---
Lowering the Threshold | Decreases | Increases
Increasing the Threshold | Increases | Decreases