Peter and Hull (1969) proposed the Peter Principle, the observation that in hierarchical organizations, people are promoted based on performance in their current role until they reach a level at which they are incompetent, because the skills that produce success at one organizational level are frequently different from those required at the next. Decades of subsequent research have confirmed the underlying dynamic while adding nuance: the primary problem is not that organizations promote people to incompetence but that they use the wrong criteria in making promotion decisions, systematically overweighting current role performance and underweighting the specific capabilities that performance in the next role requires. This article reviews the promotion decision errors most consistently documented in organizational research, examines their organizational costs, and addresses the assessment and decision processes with the strongest evidence base for improving promotion decision quality.
The Systematic Errors in Promotion Decisions
The most pervasive promotion decision error is performance-role conflation: evaluating candidates for promotion to a higher-level role primarily on their demonstrated performance in their current role, without systematically assessing whether the capabilities that produced that performance will generalize to the significantly different demands of the next role. Bock (2015) reported that Google's research on promotion decisions consistently found that current role performance was a necessary but not sufficient predictor of next role success, and that the capabilities most predictive of next level effectiveness, including people leadership, cross-organizational influence, and strategic thinking, were not systematically assessed in most promotion decisions, allowing high current performance to substitute for an assessment of capabilities not yet required in the current role.
The visibility bias is the second systematic error, describing the consistent overweighting of candidate characteristics that are observable and memorable to decision-makers relative to those that are important but less visible. Candidates who are articulate, confident, and socially facile in the contexts where senior leaders observe them receive higher promotion consideration than those whose capabilities are equally strong but less visible in those specific contexts. The visibility bias systematically advantages candidates who are in high-visibility roles, who are socially proximate to senior decision-makers, and who are skilled at performing competence rather than simply demonstrating it, regardless of whether the characteristics that produce visibility predict success in the higher-level role.
Confirmation bias in promotion decisions operates through the tendency to seek and weight information confirming the initial impression of a candidate's readiness for promotion rather than systematically evaluating the evidence against that impression. Once a senior leader has formed a favorable impression of a candidate, whether from a single high-visibility performance or from the accumulated positive association of working proximity, subsequent information about the candidate is processed through the lens of that initial impression. Information consistent with the impression receives high weight; information inconsistent with it receives low weight or is rationalized away. The result is promotion decisions that reflect the initial impression formed in specific and potentially unrepresentative contexts rather than a systematic evaluation of the candidate's full capability profile.
The representativeness heuristic produces the fourth systematic error: evaluating candidates' promotion readiness by comparing them to the prototype of a successful person in the target role based on visible surface characteristics rather than on the specific capabilities that actually predict success in that role. Organizations whose most visible successful senior leaders are a relatively homogeneous demographic group produce promotion decisions biased toward candidates who resemble that group in visible characteristics, because the representativeness heuristic associates visible similarity to the prototype with likelihood of success regardless of whether the surface characteristics being compared actually predict the relevant capabilities. This mechanism is among the most consistently documented in organizational research and among the most consequential for the diversity of leadership pipelines.
The Organizational Costs of Poor Promotion Decisions
The direct organizational cost of a poor promotion decision includes the performance deficit of a leader operating below the capability level their role requires, the remediation investment required to address that deficit, and the organizational disruption if the deficit is severe enough to require the leader's demotion or departure from the role. These direct costs are typically calculated in organizational post-mortems on failed promotions, and they are consistently larger than organizations anticipated because the true cost of leadership underperformance is distributed across the performance of every organizational member the underperforming leader influences: their direct reports, their organizational peers, and the organizational units that depend on their leadership.
The indirect organizational cost of poor promotion decisions is typically larger than the direct cost and almost never calculated. When organizations promote people based on criteria that include visibility, social proximity, and surface similarity to existing leadership, they systematically overlook candidates with strong relevant capabilities who are less visible, less socially proximate, and less similar to existing leadership in surface characteristics. The opportunity cost of the capabilities those overlooked candidates would have brought to the higher-level role is real and compounding: over years of systematic underselection, the organizations' leadership quality is substantially lower than it could be, and the diversity of perspective, approach, and problem-solving that more capable leadership would provide is consistently forfeited.
The cultural cost of poor promotion decisions is the organizational signal they send about what the organization actually values. Promotions are among the most powerful organizational signals available to senior leaders because they translate the abstract statements about organizational values into concrete observable behavioral evidence: the people who get promoted in this organization are people who did these specific things. When promotions are driven primarily by current role performance, visibility, and social proximity rather than by assessed readiness for the higher-level role's specific demands, the organizational population accurately reads the signal that performing well in the current role, being visible to senior leadership, and being socially proximate to decision-makers are the organizational behaviors most reliably producing advancement, regardless of what formal competency frameworks or stated organizational values communicate.
The pipeline cost is the most consequential and least immediately visible: poor promotion decisions accumulate in the leadership pipeline over years and decades, progressively filling senior roles with leaders whose promotion criteria did not include systematic assessment of the capabilities most predictive of success at those levels. Organizations whose promotion decisions are systematically biased toward visibility and current performance over assessed next-level capability find that the quality and diversity of their senior leadership progressively diverges from what their formal talent management systems would suggest it should be, because the gap between the assessment criteria used in formal talent reviews and the actual drivers of promotion decisions produces selection outcomes that reflect the informal criteria rather than the formal ones.
What Assessment Should Drive Promotion
The assessment approach with the strongest evidence base for improving promotion decision quality is structured behavioral assessment of the specific capabilities most predictive of success in the target role rather than holistic evaluation of overall performance and potential. The capabilities most predictive of success in management roles differ systematically from those most predictive of success in individual contributor roles: interpersonal influence, the ability to produce outcomes through people rather than through personal execution; developmental orientation, genuine interest in and investment in the capability growth of others; organizational navigation, the ability to coordinate across organizational boundaries and to build the cross-functional relationships that complex organizational work requires; and judgment under ambiguity, the ability to make effective decisions with incomplete information under time pressure.
Schmidt and Hunter's (1998) meta-analysis established that structured behavioral interviews, validated work samples, and multisource behavioral assessment are the highest-validity assessment approaches for predicting job performance, with substantially higher validity than the unstructured interviews and informal references that most promotion decisions rely on. The investment in structured assessment for promotion decisions is proportionate to the stakes of those decisions: poor promotion decisions produce organizational costs that typically exceed the cost of rigorous assessment by large multiples, making structured assessment economically justified even for single promotion decisions at senior organizational levels.
Promotion calibration processes, in which multiple senior leaders review and discuss promotion candidates using structured assessment data rather than relying on individual promotion sponsors, address the confirmation bias and visibility bias problems that characterize single-decision-maker promotion processes. Calibration works most effectively when it is structured around specific behavioral evidence for the capabilities most relevant to the target role, when it explicitly requires assessment of each capability based on evidence rather than on overall impression, and when it includes mechanisms for surfacing the overlooked candidates who may have strong relevant capabilities but lower organizational visibility. The calibration conversation most likely to improve decision quality is one in which each decision-maker must specify what behavioral evidence they have for their assessment of each candidate, rather than one in which overall impressions are shared and the majority view is adopted.
The specific assessment content most predictive of promotion success at the management-to-senior-management transition includes examples of producing outcomes through others rather than through personal execution, examples of developing the capability of direct reports as evidenced by their performance and career advancement, examples of cross-functional influence without formal authority, and examples of effective judgment in high-stakes situations with incomplete information. Assessment that probes these specific examples with follow-up questions about what the candidate specifically did, what drove their specific choices, and what outcomes resulted from those choices produces behavioral evidence of the most predictive capabilities that general performance discussions and holistic promotion readiness assessments do not.
Building Better Promotion Systems
Promotion systems that consistently produce better decisions combine three elements: explicit criteria specifying the capabilities most predictive of success in the target role rather than relying on general potential or current performance assessments; structured assessment processes providing behavioral evidence for those specific capabilities; and calibration conversations that make the evidence visible to multiple decision-makers and that explicitly require assessment of overlooked candidates alongside the most visible ones.
The process design feature most directly addressing the visibility and social proximity biases is the structured nomination process that requires each nomination sponsor to provide specific behavioral evidence for the capabilities being assessed rather than allowing general advocacy for candidates known to the sponsor. When sponsoring a promotion requires the specification of behavioral evidence rather than the assertion of the candidate's readiness, the social proximity advantage is reduced: sponsors can only advocate effectively for candidates whose relevant behaviors they have actually observed. This shifts the advantage from candidates who are socially proximate to senior leaders to candidates who have demonstrated relevant behaviors in contexts that senior leaders have observed.
The organizational investment in improving promotion decision quality is one of the highest-leverage talent management investments available because the quality of promotion decisions compounds through the organization's leadership hierarchy. Leaders who were promoted on the basis of rigorous capability assessment are more likely to create the organizational conditions for excellent performance in their own roles and more likely to invest in the rigorous identification and development of the people they will sponsor for future promotion. Organizations whose promotion decisions consistently reflect rigorous assessment of next-level capabilities progressively build a leadership hierarchy whose capability level exceeds what the same initial talent pool would produce with less rigorous promotion processes.
The specific commitment most required for improving promotion decision quality is senior leadership commitment to the principle that current role performance is necessary but not sufficient for promotion, and that candidates must demonstrate readiness for the specific capabilities required at the next level through behavioral evidence rather than through advocacy and impression. This commitment is difficult to sustain because it requires declining to promote high-performing, high-visibility candidates who lack evidence of readiness for the next level's specific demands, which is organizationally uncomfortable for the senior leaders who have invested in those candidates and who believe that their current performance predicts future performance across role transitions. The organizational discipline to maintain this commitment, across individual cases where it is inconvenient, is what distinguishes promotion systems that build leadership quality over time from those that produce the Peter Principle dynamics that Peter and Hull documented.
- Bock, L. (2015). Work rules! Twelve.
- Peter, L. J., and Hull, R. (1969). The Peter Principle. William Morrow.
- Schmidt, F. L., and Hunter, J. E. (1998). The validity and utility of selection methods in personnel psychology. Psychological Bulletin, 124(2), 262-274.