That’s a loaded question. There are many reputable consulting companies, and each probably has “better” parts. I would say that it is probably a function of what your CTQs are. For instance, if you are in a particular industry there may be a consulting company with more experience in that industry.
From what I’ve seen, most BB training is 4 weeks long (separated by a few weeks in between each week when you can complete parts of your project), and costs anywhere from $10-30,000. You can do it online for less, but you should be aware of the benefits and pitfalls if you decide to go that path.
Ren
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