法规层面应该没有(在中国的GMP及其附录中也仅仅有关键质量属性这个定义),但是可以参考ICH Q8这个指南中的相关定义:
Critical Process Parameter (CPP): A process parameter whose variability has an impact on a
critical quality attribute and therefore should be monitored or controlled to ensure the process
produces the desired quality.