Iterative defect filtering process

A non-transitory computer readable storage medium having instructions that, when executed by a processing device of a computerized system, cause the processing device to perform operations comprising:

• obtaining defect candidate information about a group of defect candidates, wherein the defect candidate information comprises values of attributes per each defect candidate of the group;
• selecting, by the processing device of the computerized system, a selected sub-group of defect candidates in response to values of attributes of defect candidates that belong to at least the selected sub-group;
• classifying defect candidates of the selected sub-group to provide selected sub-group classification results;
• repeating, until fulfilling a stop condition:
• selecting an additional selected sub-group of defect candidates in response to (a) values of attributes of defect candidates that belong to at least the additional selected sub-group;
• and (b) classification results obtained from classifying at least one other selected sub-group;
• and
• classifying defect candidates of the additional selected sub-group to provide additional selected sub-group classification results.