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To track the changes on a particular defect field we need to follow these steps :
1. Open QC with credentials of user who has customisation rights
2. Go to Tools &gt; Cutomize &gt; Entities
3. Expand Defects field names under System fields or User fields.
4. Select a particular field and check on history at the details of the field in right
5. Save the changes.
Now onwards whenever some change happens on that field, history will show following details against that field name :
1. Who changed
2. When changed
3. What was old value
4. What is new value