Useful. Having Montessori teacher qualification certificate can be used as a proof of teachers' professional knowledge and level, which is helpful to gain the trust of employers and contribute to longer-term career development. Holders of Montessori teacher qualification certificate can use the characteristics of the certificate to prove their ability and leave a good impression on others in the scene of job hunting, promotion and salary increase. Moreover, Montessori education is a unique method of early childhood education, which has been widely recognized. Montessori teacher qualification certificate is certified by Montessori educational institutions, which has certain authority and credibility. In Montessori educational institutions, teachers with teacher qualification certificates often get better career opportunities and treatment. So Montessori teacher qualification certificate is useful.