Few decisions are watched as closely by employees as promotions. Every one sends a message about what the organisation values. When promotions seem to go to the best-connected rather than the most capable, trust falls quickly, and good people start looking elsewhere.
A fair promotion process does not guarantee everyone will be happy with the outcome. It does mean the decision can be explained.
Two kinds of promotion
It helps to separate two situations.
Promotion into a vacancy. A higher-level role becomes available and several people may be considered. This is a selection decision.
Progression within a career path. An employee grows into a higher level of the same job, for example from professional to senior professional, without a vacancy. This is a readiness decision.
Each needs a slightly different process, but both depend on clear criteria and evidence.
Clear criteria
Criteria should come from the requirements of the higher-level role, not from the employee's tenure or current performance alone. A useful set covers: