What is My Tech Radar?

My personal Tech Radar is a list of technologies, complemented by skills level, called ring assignment. I use three rings with the following semantics:

• EXPERT — Technologies we have high confidence in to serve our purpose, also in large scale. Technologies with a usage culture in our Zalando production environment, low risk and recommended to be widely used.
• COMPETENT — Technologies that we have seen work with success in project work to solve a real problem; first serious usage experience that confirm benefits and can uncover limitations. TRIAL technologies are slightly more risky; some engineers in our organization walked this path and will share knowledge and experiences.
• BEGINNER — Technologies that are promising and have clear potential value-add for us; technologies worth to invest some research and prototyping efforts in to see if it has impact. ASSESS technologies have higher risks; they are often brand new and highly unproven in our organisation. You will find some engineers that have knowledge in the technology and promote it, you may even find teams that have started a prototyping effort.