Most organizations claim to have succession planning. Far fewer have a succession planning practice that meaningfully changes what people learn, how they grow, and who is ready when a critical role opens up. The gap between "we identified some high-potentials" and "we systematically prepared people for bigger responsibilities" is where L&D has the most to contribute — and the most to lose if it stays on the sidelines.
Start by identifying the roles that actually matter. Not every position needs a formal succession plan. The roles that warrant serious attention are the ones where a vacancy would cause outsized disruption: roles with specialized institutional knowledge, roles that sit at key decision-making intersections, and roles where external hiring is slow, expensive, or unlikely to succeed. A common mistake is equating "critical role" with "senior title." A plant manager overseeing a complex operation or a principal engineer who is the only person who understands a legacy system can be just as critical as a vice president. The identification process should involve business leaders, not just HR, and it should be revisited at least annually because the landscape shifts.
Once you know which roles matter most, the next step is assessing readiness — and this is where most succession plans quietly die. Organizations put names on a chart and label people "ready now," "ready in one to two years," or "ready in three to five years," and then nothing happens. Readiness is not a label; it is a development trajectory. For each potential successor, you need a clear-eyed view of the specific capabilities they would need in the target role, an honest assessment of where they stand today, and a concrete plan to close the gap. That plan should include real developmental experiences — not just courses.
This is where L&D becomes essential. The most powerful development for future leaders tends to come from stretch assignments, cross-functional projects, acting roles during leaves or transitions, exposure to board-level or executive-level decision-making, and structured mentoring from someone who has held the target role. Formal learning programs can supplement these experiences, particularly for building financial acumen, strategic thinking frameworks, or leadership capabilities that are hard to pick up solely through on-the-job exposure. But the classroom or digital learning component should always be in service of a real developmental goal, not a generic leadership curriculum applied to everyone equally.
One of the most damaging pitfalls in succession planning is secrecy taken to an extreme. Some organizations treat their succession lists as highly classified documents, never telling the people on them that they are being considered for bigger roles. The rationale is usually fear: what if we tell someone they are a successor and then do not promote them? But development without awareness is almost impossible. People need to understand what they are developing toward in order to make intentional choices about their growth. That does not mean you have to promise anyone a specific job. It means having honest career conversations about potential paths, the capabilities those paths require, and the experiences that would help. Transparency, handled well, is motivating. Silence breeds disengagement.
Another common failure mode is over-reliance on a single successor per role. If your plan has exactly one name next to each critical position, you do not have a plan — you have a single point of failure. Building a broader bench of capable people is more resilient and also more equitable. Succession planning that consistently surfaces the same demographic profile of candidates is a signal that the development pipeline upstream has problems worth examining.
Diversity in the successor pool does not happen by accident. It requires intentional action much earlier in the talent lifecycle: equitable access to high-visibility projects, sponsorship (not just mentoring) for people from underrepresented groups, and structured talent reviews that challenge managers to look beyond their usual circle of favorites.
Finally, succession planning must be treated as an ongoing practice, not an annual event. A yearly review of the chart is necessary but not sufficient. The real work happens in between: tracking whether development plans are actually being executed, creating opportunities for successors to demonstrate readiness in real situations, updating assessments as people grow or as role requirements change, and holding leaders accountable for developing their teams rather than hoarding talent.
For L&D professionals, the opportunity here is significant. Succession planning gives learning strategy a direct line of sight to business continuity and leadership effectiveness. When you can connect a development program, a stretch assignment, or a coaching engagement to a specific succession need, you are no longer delivering training for its own sake. You are building organizational capability with a clear purpose. That connection — between the learning someone does today and the role they might step into tomorrow — is what turns succession planning from a compliance exercise into a genuine competitive advantage.