Deep and impactful learning is always achieved by "doing", over and over and over again. Yet, most organizations attempt to train key leadership skills in the classroom, via newsletters, company intranet sites, etc. Research shows that we retain or learn only 10% of what we hear, but nearly two-thirds when we do.
Though more difficult and time and resource intensive, leadership skills must be taught on the job with sufficient repetition and learnings discussed. Every project and every meeting should be a leadership development opportunity.