[eropple]

In the perfectly spherical Agile world, yes.

In practice, for anything that's new, your project devolves into a set of spikes for development because your time-boxed investigation leaves unknown unknowns everywhere. Which is fine in that perfectly spherical Agile world, but it makes less-than-perfectly-spherical stakeholders very upset that they are not getting to use the Agile stick to beat over their developers' heads, as they have been trained to do.