Nine-Box Grid

The grid has nine cells, with each axis commonly split into low, medium and high, so a person's placement is the intersection of the two ratings. Define performance and potential separately: performance should reflect evidence about the person's current role, goals and results over a stated period rather than a recent impression, while potential may mean readiness for a specific future role, ability to learn new skills or capacity for wider responsibility, and the organisation should say which.

High current performance does not automatically mean readiness to manage people, as a strong technical specialist may want a different career path, and low current performance does not prove low long-term potential, because a new role, weak support or an inaccessible process can affect results. Start from role needs, since succession planning should identify future work and the capabilities it requires and a generic "high potential" label may be too vague.

Use several sources, because results, feedback, work samples and structured assessments can help challenge one manager's view, though none should be treated as infallible. Calibrate across teams, as managers may use different standards for the same rating and a review discussion can surface those differences.

Avoid comparing unlike roles without context, because a sales target and a research project need different evidence; the grid can still support discussion, but not a crude ranking. Look for bias, since visibility, similarity to a manager, access to stretch assignments and assumptions about availability can influence potential scores.

Keep records of reasons and make the outcome useful: if a rating affects opportunity, document the evidence and proposed development actions, because a cell label alone is not a plan and a person who may be ready for a future role needs relevant experiences, coaching and feedback, not merely a place in a box. Support all employees and respect career preference: people outside the top-right cell may need training, role changes, recognition or clear performance support, and someone may have skill for leadership but not want a management role, so discuss interests rather than assigning a path in secret.

Review periodically, because current performance and future readiness can change with opportunities and support, and a placement should not become permanent. Protect confidentiality and separate development from adverse action, since talent reviews contain sensitive personal judgments, so limit access, handle records under local privacy and employment rules, and remember that a grid is no substitute for a fair performance-management or employment process, with local HR and legal review where decisions carry consequences.

Check succession depth: if a key role has no ready candidates, the organisation may need development, external recruitment or a revised role design. Do not convert the grid into a single precision score, because "high" and "medium" boundaries are often subjective and rounding them to a percentage can create false certainty.

A high-potential share can be reported descriptively if criteria are clear, and twelve of 80 reviewed employees is 15%, but the number says little about readiness without the role context. Gallup describes the performance-potential structure and warns that subjectivity and bias can undermine it, and SHRM also identifies the grid as a succession-planning tool.

For an owner, it can organise a conversation about talent and future roles, but its value depends on evidence, calibration and actual development opportunities rather than the grid alone.