How Can the Margin of Error in Promotion Decisions Be Reduced?

Most decisions taken within an organisation are documented, justified and reviewed at regular intervals. Promotion decisions tend to fall outside this discipline. They are made in a short management meeting, on the basis of a few sentences of reasoning and largely on personal observation. Their consequences, however, unfold over years: a manager struggling in a new role, rising turnover within the team, delayed projects and a change of position that is difficult to reverse.

The margin of error in promotion decisions rarely stems from carelessness. Its source is far more structural: the data available at the moment of decision is not of the same kind as the data the decision requires. What is available is a record of past output, while the decision calls for a prediction of future behaviour. The distance between these two sets of data is precisely where the margin of error widens.

One reason this distance remains invisible is the symbolic weight a promotion carries within an organisation. Promotion decisions concern more than one individual; they are the clearest statement an organisation makes about what it rewards, which behaviour it holds up as an example and which criteria advancement depends on. The soundness of the decision therefore matters as much as the way it is constructed. A promotion decision with undefined criteria influences not only a single appointment but how every employee positions their own career expectations.

This article examines why promotion decisions are systematically made with incomplete inputs, where the margin of error widens, and how structured assessment approaches narrow it.

Visible Success Is No Guarantee of Success in the Next Role

The starting point of a promotion decision is almost always the same: the individual is delivering above expectations in their current role. This observation is accurate and important. On its own, however, it does not mean the same performance will be repeated one level up, because the success being measured is the success of the competencies the current role requires.

In specialist roles, performance is shaped by technical depth, speed of problem solving, business knowledge and personal discipline. In managerial roles, the determining factors come from a different set: allocating work, setting priorities, managing conflict, distributing resources, communicating with senior management and the team at the same time, and delivering performance feedback. These two sets do not exclude one another, but neither does one automatically contain the other. The assumption that an individual who excels in one will produce the same result in the other is the weakest link in the decision.

The outcome frequently produces a loss on both sides. The organisation removes a productive specialist from their own field and gains, in return, a manager who is struggling in a new role. The effect is not confined to that individual. A misalignment at management level is reflected in the motivation of direct reports, in the flow of work within the team and, over time, in employee turnover.

A decisive distinction applies here: is promotion a reward or an appointment? Reward logic looks backwards and recognises past contribution. Appointment logic looks forwards and asks what capacity the role requires. Most organisations describe promotion in the language of reward and then live with the consequences of an appointment a year later. Moving the decision out of the reward category and into the appointment category is the first step in narrowing the margin of error.

This distinction does not mean contribution goes unrecognised. Strong performance can be recognised through remuneration, a wider remit, a specialist career grade or project responsibility. When management is constructed as the only route upwards, even those who wish to deepen their expertise are obliged to move into managerial roles. In that case the organisation absorbs two losses at once: it turns a specialist who wanted to preserve their technical depth into a reluctant manager, and it leaves outside consideration another candidate who could genuinely have been strong in the role.

What happens in the first months of the transition reinforces this picture. Someone moving into a management role naturally reverts to the behaviours that brought success in the previous one. They take on the work themselves, go into detail and resolve the most difficult matters personally. In the short term this approach produces results and is received positively. In the medium term it narrows the team's area of responsibility, concentrates decision points in a single person and limits the manager's capacity to the volume of work they can personally absorb. The source of the problem is usually not the individual's inadequacy but an unsupported transition.

Some organisations attempt to manage this risk by opening the promotion to a trial period. Acting appointments, project leadership or an extended remit all serve this purpose. These methods create a valuable field of observation but are not sufficient on their own, because most interim steps are carried out with temporary authority and limited accountability for outcomes. The weight of a permanent management role cannot be fully observed under such conditions.

What Data Is Actually on the Table?

The inputs available when a promotion decision is taken generally fall under the following headings. None of them is wrong; but all of them face in the same direction and share the same blind spot.

• Performance reviews: They measure the output of the current role. They carry no direct information about the behaviours the next role requires.

• Managerial observation: It is formed from a narrow sample and is influenced by the conditions of the period in which it took place. An impression formed during an intense period may not represent behaviour under normal conditions.

• Seniority: Time spent in a role does not indicate the capacity to carry responsibility beyond it.

• Visibility: Employees in more frequent contact with decision makers come to the fore relative to others whose contribution is equivalent.

• Recency effect: The results of the last quarter outweigh performance spread across a longer period.

• Similarity bias: A candidate whose working style resembles that of the decision maker is generally perceived as a better fit.

What these inputs have in common is that all of them confirm past performance from different angles, and none provides an independent indicator of future behaviour. Decision makers therefore receive the same information through six different channels and interpret this as consensus. What is actually present is not consensus but the repetition of a single type of data.

The missing set of information is this: under which working conditions the individual is productive, which types of task they gravitate towards, which behavioural patterns they adopt under pressure, how they respond to feedback, and whether they prioritise speed or verification when taking decisions. Some of this can be gathered through observation, but observation can only capture behaviour displayed under existing conditions. Because the conditions of the new role have not yet arisen, behaviour under those conditions has never been observed.

Structured inventories address precisely this gap. They set out an individual's job preferences, behavioural tendencies and inclinations under pressure independently of their current role. Decision makers are thereby able to add a second layer of data, concerning future fit, alongside the record of past output.

The area in which this layer proves most useful is the reading of tendencies that appear contradictory at first sight. A manager is expected to be decisive and to listen to their team, to move quickly and to weigh risk, to uphold standards and to show flexibility. Someone strong on only one side of these pairs tends to overstate that strength under pressure. Decisiveness can turn into imposition, speed into a hasty decision, and the defence of standards into rigidity. One of the most tangible contributions of pre-promotion assessment is that it shows, before the appointment, on which pairs the individual is balanced and on which they are one-sided.

Other inputs can also sit alongside assessment data. An application that gathers feedback from different levels makes visible not only how the individual appears to their manager but how they are experienced by their team and their peers. A structured interview establishes, through concrete examples, how the candidate has taken decisions under comparable conditions in the past. Assignments carrying an extended remit create a limited but real field of observation. What these inputs share is that each produces information independent of the current role's output. What improves the accuracy of a promotion decision is not the use of a single instrument but the combined evaluation of inputs that complement one another.

What Pre-Promotion Assessment Contributes to the Organisation

The first thing a structured assessment practice brings to an organisation is a common language. A discussion in which each decision maker relies on their own observation and their own criteria becomes a discussion conducted through defined competency headings. This does not shorten the debate, but it raises its accuracy.

The practical effect of a common language is that the discussion shifts from individuals to criteria. In meetings without assessment data, the decision usually forms around the view of whoever believes they know the candidates best. That view may well be correct, but whether it is correct cannot be tested within the meeting. Once defined competency headings are introduced, each decision maker conveys their observation through the same framework and differences of opinion are attached to a specific heading. The discussion then focuses not on who speaks most persuasively but on which competency is more decisive for the role.

The burden a wrong appointment places on the organisation completes this picture. That burden rarely appears as a single line item; it is distributed across a decline in team productivity, work that begins to fall behind schedule, rising turnover, the time invested in developing the manager and, where necessary, a search process that has to be reopened. The fact that these items are scattered does not mean the total effect is small. On the contrary, because they are scattered they are seldom calculated as a whole, and therefore provide no feedback into decision processes. Organisations that review the outcomes of their promotion decisions at regular intervals gain, over time, a clear view of which criteria genuinely predict success.

The second gain is that development areas become visible before the appointment. No candidate possesses every competency the next role requires. The difference lies in whether these gaps are recognised before or after the appointment. A development area known in advance can be addressed through an executive coaching programme, a defined mentoring relationship or a monitoring schedule for the first months. The same gap identified afterwards is treated as a performance issue, takes longer to correct and damages the individual's standing within the organisation.

The third is that the rationale for the decision becomes documentable. Promotion decisions are the most widely discussed decisions within an organisation and the ones that most directly shape perceptions of fairness. Employees who are not promoted fill the gap with their own interpretations when they do not know the reasoning. A process resting on defined criteria narrows that space for interpretation and gives the Human Resources function a defensible basis.

The fourth is a reduction in the cost of reversal. Correcting a wrong appointment requires the individual to return to their former role, a new search to begin and the team to sit in temporary uncertainty in the meantime. Structured assessment does not eliminate this possibility, but it reduces its likelihood in measurable terms.

Several points shape how the process is set up. The first is timing. Using assessment as a means of confirmation once the decision has largely been taken is the most common implementation error. If the result supports the decision it is presented as justification; if it does not, it is set aside. This pattern of use quickly exhausts the credibility of the practice within the organisation. Applying the assessment before the decision and across the whole candidate pool both allows comparison and preserves the impartiality of the process.

The second point is sharing the results with the candidate. When a structured assessment is set up as a closed exercise producing information only for the decision maker, employees perceive it as an instrument of scrutiny. Sharing the results with the candidate within a development-focused discussion changes that perception. Even a candidate who is not promoted leaves with a concrete output regarding their strengths and development areas. This is the single most effective factor in securing internal acceptance of the process.

The third point is that assessment should not be positioned as an elimination tool. Inventory results produce a ranking of suitability, not a verdict on competence. A practice that treats the result as the sole criterion may exclude, at an early stage, candidates with different working styles who could nonetheless succeed in the role. The correct use is to bring the result to the table as a subject for discussion and to interpret it alongside the other inputs.

E&E Group has been the sole authorised representative of Harrison Assessments in Turkey since 2014 and has to date carried out more than 3,000 assessment applications. The Job Preferences Inventory and Behavioural Competency Analysis modules used in our assessment and evaluation work set out a candidate's fit for the role and their development areas through defined competency headings.

Establishing such a practice also changes the position of the Human Resources function. In structures where promotion decisions are shaped entirely at management level, Human Resources acts as an implementer that comes into play after the decision. In structures where assessment data forms part of the process, it becomes a party that establishes the criteria beforehand, manages the comparison between candidates and links the results to a development plan. Beyond improving the quality of promotion decisions, this shift also makes internal career paths easier to define.

Finally, it is worth stating what assessment is not. A structured inventory does not replace management judgement. It does not override the decision maker's intuition, their accumulated understanding of the organisational culture or their knowledge of team dynamics. What it does is add an independent and comparable layer of data alongside that accumulated understanding. The decision remains management's; the only thing that changes is the breadth of the ground on which it rests.

At E&E Group, we have supported organisations in executive recruitment, assessment and evaluation, executive coaching and change management since 1992. To build your promotion and appointment decisions on a structured assessment foundation, you can contact us.