The various inquiry models may have different names for their stages and differing structure but they all in essence follow the learning process. This is the process we all go through when learning new things whether it be a practical, scientific or information literacy-based task. This chart compares some of the various information literacy-based models including my model - Ask & Act. See also Inquiry Levels
This model by Trevor McKenzie can be found on his site as a free poster.
The 4 pillars of Inquiry and other resources can also be found there