2016 Review
Fairly neutral-positive presentation of BNI, from its inception, needs and history. The general consensus with this book is that group interaction whether it be through networking or problem-solving best function with group consensus. It's an interesting history but like all business works, tends to present information from only one positive angle.
I think a larger context of how networking as a method of creating lateral relations in industry in a time of post-industry (when capitalism has largely eradicated lateral (non-capital) relationships) arose would serve as a larger grounding for why BNI works, how it is successful and the means by which this kind of network relation is essential to business today... would have been useful. This may be beyond the scope of the book for the author and most of its target audience however.
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2020 Review
In many ways this book serves as a justification for the ideals of BNI, that the structure of BNI works for business success. Having gone through BNI I can say that it did not work for me, although an ideologue would say that I did not try hard enough, that I needed to go to more events and do something different -- which arguably can always be said. I did go to many events, and tried to network, although I did see many people who tried much less and was there for not nearly as long seemed to be more successful than I. The fact is, there is no universal procedure for success.