I've just received a rather dispiriting email from a really good student about her anxieties about the work she is drafting. Specifically, she is referring to Brookfield's "lenses" for curriculum evaluation, as I discussed them 
here (see slide 5 in particular for my point). Her concern is whether she is using the labels correctly. Is she getting it 
right?
It's dispiriting because she has missed the point, particularly in treating the lenses--the ideas--as 
objects to be learned 
about (rather as historical "facts" are) rather than as 
tools* to be 
used as appropriate, but otherwise to be set aside.
- The task is what matters. What tool do I need to do this?  
- Rather than; I've got this tool. What can I do with it?
(I admit that the perspective switch is not always clear, and sometimes the second question is important.)
But it is my fault that she has walked away with this misapprehension, and 
that is what is dispiriting. What we (those of us brought up as academics in particular) teach, defaults to being an 
object. Whereas in many cases it should be a 
tool. 
And it is our academic context which has forced this distortion. We insist on accurate regurgitation of stuff out of context, and don't ask about its 
utility and how it can be 
used **.  And (how ironic it is!) as teacher trainers in vocational education, in particular, our approach devalues that utilitarian/instrumental perspective which comes quite naturally to many of our students, and insists on "privileging" our "academic discourse".
All that is a bit heavy to put into an email response to an innocent enquiry. So what I wrote was (redacted):
Don't worry! As I understand Brookfield he holds no particular brief     for the specific "lenses" he identified--still less for the labels     he gives them. All he wants is for us to look at our work in several     different ways, or put ourselves in the shoes of different     "stakeholders" and see how it looks from their point of view--there     is no definitive list of whose perspective/lens matters or (still     less) is "best".  Each lens has something different to offer, and     they are all valuable. Sad to say, there are links to the pervasive     discourse of ... er, 
discourse....
He's arguing for what is now sometimes referred to as 
360 degree       evaluation/ appraisal/ feedback, although he goes beyond that in entertaining     conflicting views.
- The most obvious is probably the "dumbing-down" argument--the         popularising lens/perspective/value base wants ideas to be         accessible to all, while the scholarly lens protests that they         are being distorted and over-simplified. Or the employers'         perspective --"I couldn't care less what they understand about         what they are doing, as long as they do it right"-- versus the         educationalists' --"they need to know what they are doing". 
- There's a great argument rumbling at the moment, from Atul           Gawande's piece on the Cheesecake Factory. He is arguing         that medicine and surgery has a lot to learn from the fast food         industry! Totally different traditions and lenses, but what a         potentially fruitful argument.
The notion of 
frame       of reference is a variation on "lens".
...but does this kind of argument help a student make the shift*** between the forms of knowledge? 
* I'm using the terms "object", "tool" and "frame", here. 
Perkins (2010: video) uses "concept", "instrument" and "action" to mean something very similar--I'm presumptuous enough to think that my labels are clearer for someone coming to the ideas for the first time, but his much more thorough and learned exploration is well worth watching.
**It is not that one is better than the other, as a moment's thought will demonstrate. It is that we should have access to both (and more) perspectives, and be able to deploy and value them appropriately.
*** It is of course an 
epistemological shift; but I now hear that, and 
ontological, bandied about so much and so vaguely, that I am backing off from using the terms unless there is no alternative.