You have to laugh at the state of education in Florida (and to some extent, the US). While NAEP scores continue to rise throughout the country for 30+ years, you still have people screaming for the latest fad to save us. In the case of Florida, they bought into Marzano's "causal" framework.
Let's start with the most obvious problem: it's ridiculously convoluted. If I were asked to create a parody of an evaluation system, I couldn't possibly make something more hilarious than Marzano. Even they state it "works best" with a year of planning and training. What the hell kind of evaluation system requires a year of EITHER, yet alone both? (Answer: A very bad one.) If you are going to invest this kind of time (and the resources) into a program, you better have extremely high expectations for it. Sadly, pretty much everyone with a modicum of intelligence knows that this is not going to change anything (yet alone significantly for the better). It shouldn't be necessary to have to tell ostensibly well-educated people this, but a simpler (and thus more easily better understood) system will work better than a complicated one.
How many "elements" (items) are in it? The answer is 60, in four "domains" (edu-speak for "areas"; you can't charge $23/book for using simple language!). The evaluation system would be better as a bulleted list of "suggestions"--it would have saved millions of dollars. In that role (a list of "good suggestions"), Marzano is just fine.
But, surely it will be massively successful; after all, Marzano's system has been evaluated by none other than Marzano himself--just check out Research Base and Validation Studies on the Marzano Evaluation Model, April 2011.
To quote this (presumably) non-peer reviewed work, "[The] Marzano Evaluation Model is based on a number of previous, related works that include: What Works in Schools (Marzano, 2003), Classroom Instruction that Works (Marzano, Pickering, & Pollock, 2001), Classroom Management that Works (Marzano, Pickering, & Marzano, 2003), Classroom Assessment and Grading that Work (Marzano, 2006), The Art and Science of Teaching (Marzano, 2007), Effective Supervision: Supporting the Art and Science of Teaching (Marzano, Frontier, & Livingston, 2011)."
That's right--you know Marzano's framework will work because it's based on Marzano's work! (Also, Phillip Morris would like you to know that smoking increases your libido, cures cancer, and prevents male-pattern baldness.) Check out the section entitled The Research Base from Which the Model Was Developed:
"Each of the works (cited above) from which the model was developed report substantial research on the elements they address. For example, The Art and Science of Teaching includes over 25 tables reporting the research on the various elements of Domain 1."
I don't believe I've ever seen the number of tables in a book cited as evidence of the book's quality, i.e., "You know it's good because there's a lot of it." Apparently taking lots of (often old and often poor-quality) semi-related data and mashing it together makes good research. Only in education research is this even remotely possible.