On the road of code farmers, there is no way out !!!
軟體開發模型
https://flexagon.com/7-software-development-models-you-should-know/?fbclid=IwAR0SMzCW-rYEaV5Novtvgb2wuqA05HDpV60n-GnSaG4clFwpvGGzaCPXeCg
https://ithelp.ithome.com.tw/articles/10198394
https://medium.com/3pm-lab/how-to-manage-unexpected-product-change-requests-abce9ed6bd13