Although research shows that 70% - 80% of major change initiatives fail to accomplish the desired/intended results, there are approaches that managers can employ to implement change successfully and institutionalize it.
Most organizations work on improving the knowledge, skills, (and sometimes confidence) of their workforce. They do that through training, coaching, mentoring, job rotation, and other means. That, hopefully, improves the potential of the workforce (at all levels).
Development includes training as well as a broader array of approaches including coaching, mentoring, job rotation, etc. With more opportunities for practice and feedback, development increases the chances of also improving a person’s confidence.