I think however that she has missed an important point. I believe the key lies in knowing the purpose of the inquiry and that should be the guide. As I wrote in my post Play, Passion and Purpose, the purpose of the inquiry needs to be very clear to both teacher and students right from the start. When I see inquiries that have gone off the rails it is most often because the purpose was unclear or sometimes not known at all.
If the purpose is the focus, then the inquiry simply proceeds to achieve that purpose dipping in and out of stages as the need arises and always checking in to see what else is needed to achieve that purpose. The more authentic this inquiry is and the more relevant it is to the students, the easier this will be.
In this inquiry, for example, the students in Fraser Quinn's class at Putaruru Primary wanted to make a ki-o-rahi field and set about doing just that. The students led the process under the guidance of their teacher and the purpose guided the inquiry from start to finish. This is what inquiry in the real world looks like.