Gaining a certificate that proves you can do something is important, whether it’s swimming 50 yards or a degree in astrophysics.
In the graphics industry we have a plethora of options, some more robust than others. High end colour management certification schemes, such as those from the UK’s BPIF and the Swedish Printers’ Federation confirm conformance to ISO 12647-2 (Graphic technology – Process control for the production of half-tone colour separations, proof and production prints – Part 2: Offset lithographic processes). They are audited by independent third party accredited auditors, so they are pretty much at the top of the conformity assessment tree. Schemes that are audited by a technology or product provider and confer a certificate based on the strength of a purchase, are less reliable but some are worth having.