It is both.. Success.. yes.. no crash till date.. very potent platform with very limited resources allotted initially... despite of IAF demands of tweaking and upgrading... Failure... yes.. the IOC.. the FOC... the rate of production... the contract... the red tapism ...Tejas is greatest success story that could happened India's defence sector. Development time of TEJAS is same as compare to any fourth generation fighter despite of ZERO previous knowledge and managed 75% indigenization and will be more than 92% indigenous by 2025. We have developed whole aerospace industry but still people dare to call it a failure. ADA/HAL/Govt. All did brilliant job except IAF which believe in begging. No matter how much you train a begger to behave like a Boss but he will end up begging one day.