I came back into management rather unexpectedly after a number of years theoretically retired from formal business work. During my previous career I attended umpteen management and leadership training courses, but I believe the InstLM's 49 modules are the best synthesis of theory and practice I've seen. I challenged myself to achieve full Member status through certification, rather than simply claiming against my previous business experience. The latter was accepted without question by the rival CMI, but that felt rather like "cheating". I (re)learned a huge amount going through that process and emphatically recommend it.
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