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Is what we already know sufficient? Or, shall we all study as if to take the certification, and then maybe even get a score from a sample test. Then "confirm" all this by taking a more challenging certification. Is that prudently cost-effective?
Most certificates we'd initially be taking are "good" for 3 years. Some are good for life (GFL). We can evaluate the value of formally renewing any certificate after we've actually gotten some, but I wanted to put the consideration down now.
Draft plan
Oliver thinks we all would benefit from having certified on:
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