In 1975, Richard Bandler and John Grinder, co-founders of NLP, released The Structure of Magic.  
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Within this book, the Meta Model made its official debut and was originally intended to be used by therapists.   
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It ended up becoming an integral part of NLP and has found widespread use beyond the clinical setting, including business, sales, and coaching/consulting.
 
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Download the PDF!
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 https://www.pciinstitute.net/meta-model-pdf/