Foto: "<a href="https://ccnull.de/foto/three-smiles-on-the-whiteboard-for-rating-the-products-or-services-customer-review-feedback-and-satisfaction-concepts/1026349" target="_blank">Three smiles on the whiteboard for rating the products or services. Customer review, feedback and satisfaction concepts</a>" von <a href="https://ccnull.de/fotograf/marco-verch" target="_blank">Marco Verch</a> via <a href="https://ccnull.de" target="_blank">ccnull.de</a> - <a href="https://www.flickr.com/photos/30478819@N08/50078754046/" target="_blank">Bildquelle</a>, <a href="https://creativecommons.org/licenses/by/2.0/de/" target="_blank">CC-BY 2.0</a>