1.0QUIMICA 21https://quimica21.es/en/BTI Nº 259 - QUIMICA 21rich600338<blockquote class="wp-embedded-content" data-secret="bxPyuSQiHD"><a href="https://quimica21.es/en/bti-no-259/">BTI Nº 259</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://quimica21.es/en/bti-no-259/embed/#?secret=bxPyuSQiHD" width="600" height="338" title="“BTI Nº 259” — QUIMICA 21" data-secret="bxPyuSQiHD" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script>
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Is certification mandatory? Is it worth it? Who is making you get certified? It is certainly not the law that requires certification, nor any public body, at least for the vast majority of sectors. However, your clients may effectively compel you – not directly,...