olemus
(a) süsteemi elementidevaheliste teenuste hierarhiline mudel
= hierarchical model of the inter-system services

http://www.dis.ch/resources/tree.pdf

https://www.researchgate.net/profile/Nane-Kratzke/publication/265089604/figure/fig3/AS:392205349998596@1470520450235/Qualitative-Cloud-Impact-to-the-ITIL-V3-Process-Tree.png

(b) teenuste hierarhiliselt liigendatud kataloog
= hierarchically structured catalog of services

https://www.youtube.com/watch?v=vPIHU5cJerc

https://w7.pngwing.com/pngs/861/427/png-transparent-social-media-marketing-tree-network-pamphlet-computer-network-web-design-service.png