The triads are at a higher level. Once you get down to individual contributors there is typically a high ratio of Dev and QA to PM (maybe 1-2 PMs per team of 15

The triads are at a higher level. Once you get down to individual contributors there is typically a high ratio of Dev and QA to PM (maybe 1-2 PMs per team of 15), and usually a couple more Devs than QA. I'm not sure how widely those ratios are enforced or how much it varies from team to team.