Sources 

Literature

https://upload.wikimedia.org/wikipedia/commons/0/08/Biface_Cintegabelle_MHNT_PRE_2009.0.201.1_V2.fond.jpg

https://onczc2b6ue2326uu7kzluhwq-wpengine.netdna-ssl.com /wp-content/uploads/inspect-dashboard-1317x800.jpg

https://kactus.io

https://iasonm.wordpress.com/2013/07/16/πόλεμος-ή-ειρήνη-ένταση-ή-δύναμη-μέσα/

https://www.weigang-sb.de/plantafel/einsatzbeispiele/

https://www.nytimes.com

https://resilientwebdesign.com

https://www.br.de/themen/ratgeber/inhalt/computer/ internet-www-geschichte-100.html

https://www.eyeqinsights.com/power-visual-content-images-vs-text/

https://matthewstrom.com/writing/research-empathy-simplicity-speed?ref= uxdesignweekly

https://plantapp.io/#features

https://www.goabstract.com

https://www.figma.com

https://www.justinmind.com

https://milanote.com

https://www.mindmeister.com/de

https://cirkus.com/de/

https://www.atlassian.com/software/jira

https://basecamp.com/how-it-works

https://medium.com/swlh/how-slack-became-a-5-billion-business-by-making-work -less-boring-f78bdad685c8

https://medium.com/sketch-app-sources/7-essential-prototyping-tools-to -use-with-sketch-c7a594f486a0

https://www.ideo.com/post/method-cards

https://www.atlassian.com/agile/kanban

http://www.gv.com/sprint/

https://www.jstor.org/stable/2575191?seq=1#page_scan_tab_contents

https://en.oxforddictionaries.com/definition/tool

https://forumone.com/ideas/what-is-design-system

http://atomicdesign.bradfrost.com/chapter-1/

https://resilientwebdesign.com

https://uxplanet.org/the-evolution-of-ux-process-methodology-47f52557178b

https://www.oreilly.com/ideas/what-is-lean-ux

https://www.oxagile.com/company/blog/the-waterfall-model/