Toyota Motor Corp. said Monday it is inviting four outside experts to help beef up quality control at the recall-battered automaker under a program that began in March to review defect measures.

Toyota said it was tackling a number of improvements, including analyzing each accident and consumer complaint more thoroughly and boosting communication with journalists and other outsiders to be better at ensuring quality.

The world's top automaker has seen its once sterling image for quality plunge since October after recalling more than 8.5 million vehicles around the world with defective gas pedals, faulty floor mats, software glitches and other problems.