We have a lot of commercial ATPG tools to generate patterns for specific faults like stuck-at, delay faults. But which tool will provide more reliable patterns which can be used for research purposes?
It's true that there are number of ATPGs available in market but for quality comparison, it is required to have hands on on all tools. which may be not possible because of unavailability of all tools to single institute considering their cost involved. So difficult to answer.