Is waterfall even a thing? I feel like the software industry is constantly coming up with solutions to cultural problems that were more relevant in 1977 than 20

Is waterfall even a thing? I feel like the software industry is constantly coming up with solutions to cultural problems that were more relevant in 1977 than 2017 Ive worked at places that werent "agile" and it wasnt the strawman experience of waterfall.. it was just people doing work. They just didnt make a big deal about squeezing everything in a two week window and avoided uncomfortable/useless planning and retrospective meetings.