The Tech Radar is a list of technologies, complemented by an assessment result, called ring assignment.
Four rings have the following semantics:
Technologies used on daily basis we have high confidence in to serve our purpose, also in large scale.
Technologies with a usage culture in production environment, low risk and recommended to be widely used.
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.
Technologies that are promising and have clear potential value-add.
Worth to invest some research and prototyping efforts in to see if it has impact.
They are often brand new and highly unproven in our organisation.
Technologies not recommended to be used for new projects.
Technologies that we think are not (yet) worth to (further) invest in.
Should not be used for new projects, but are continued for existing projects.