Published in 1976 so it has some aging.
This is 3 science fiction novellas in a combined book. They are by the authors; Vonda N. McIntyre, Maria Randall, and Joan D. Vinge.
All three of the stories included in this book were interesting, and each presented a nice slice of worldbuilding from their respective glimpses at future civilizations. None of the stories were particularly optimistic about humanity (in contrast to some sci-fi that presents humanity’s technological progress as morality and have very humanist overtones).