[breakattn]

It is best just to read the first book. It is complete in itself.

And then there is Whipping Star, which is best skimmed through so that you can get to The Dosadi Experiment.

In fairness, Whipping Star is a fabulous take on what it would be like to attempt to communicate with an alien species that does not share our basic assumptions.

Dosadi Experiment is filled with fascinating ideas. Little gems like: “Does a population have informed consent when that population is not taught the inner workings of its monetary system, and then is drawn, all unknowing, into economic adventures?”

[dunefox]

Nah, it's best to read all 6 books by Frank Herbert. They're incredibly good.