Span of Control and Motivation on the Night Shift at Meridian Components
Meridian Components runs a 60-person night shift producing precision parts. The shift supervisor, Kamal, directly manages all 60 operators. Absenteeism on nights is 14% against 5% on days, scrap rates are 40% higher, and voluntary turnover among night staff is 30% a year. Exit interviews repeatedly mention that 'nobody notices what you do' and that problems take days to reach anyone who can fix them. Kamal works a 12-hour shift and spends most of it resolving machine faults himself because he says briefing 60 people individually is impossible. The plant manager proposes adding two team leaders, each managing 20 operators, at a total cost of Tk 1,200,000 a year. The finance director objects that the shift already has a supervisor and that the cost equals 4% of the shift's annual contribution. The plant manager also wants to introduce a monthly production bonus paid to the whole shift rather than to individuals.
1. Diagnose the night shift's problems using span of control, and assess whether the two team leader posts are justified.
Read the worked answer
Span of control. Kamal's span is 60, which is far beyond what is workable where the work is interdependent, safety-sensitive and requires coaching. A defensible span depends on task variety, the competence of subordinates, the physical dispersion of the work and the amount of non-supervisory work the manager must also do. Here all four factors point to a narrow span: precision machining requires correction and coaching, operators are dispersed across machines, and Kamal is also expected to manage faults.
The symptoms are consistent with an overloaded span. When a manager cannot reach individuals, three things follow: performance feedback disappears (hence 'nobody notices'), problems queue because there is no one empowered to solve them locally, and the manager retreats into technical work he can control, which is exactly what Kamal does with machine faults. Absenteeism, scrap and turnover are the measurable results. The exit interview data is the strongest evidence, because it identifies the mechanism rather than merely the outcome.
Is the cost justified? The finance director is comparing the cost to contribution without comparing it to the cost of the problem. A 14% absence rate on 60 staff is roughly 8.4 lost shifts a week; a 40% higher scrap rate on a precision line is likely to dwarf Tk 1,200,000. Turnover at 30% means about 18 replacements a year, each carrying recruitment, induction and lower early productivity. The proposal should be justified by quantifying these costs rather than by asserting that supervision is good practice.
However, the posts alone will not fix it unless the team leaders are given real authority to stop a machine, reassign work and resolve routine problems. Adding layers without delegating authority simply inserts two more people who must escalate.
2. Evaluate the proposal to pay a monthly bonus to the whole shift rather than to individuals.
Read the worked answer
Case for the group bonus. The work is interdependent: a fault at one machine stops the line, and scrap is often caused upstream of where it is detected. Individual bonuses would reward operators for output they do not fully control and could encourage hiding defects. A group bonus supports cooperation and gives the team leaders something concrete to manage against. It also avoids the measurement cost and perceived unfairness of individual precision-machining metrics.
Case against, and the risks. Group bonuses weaken the line of sight between effort and reward, which is precisely the problem the exit interviews describe. A strong performer paid the same as a weak one may leave, worsening the 30% turnover. There is also a free-rider risk, and the effect on motivation depends on whether the bonus is seen as fair and achievable.
Design conditions for it to work.
- Size and threshold. The bonus must be large enough to be noticed and must have a clear qualifying threshold, for example scrap below a stated rate and attendance above a stated level.
- Controllability. Metrics must be ones the shift can influence: scrap, output against plan, attendance, safety incidents.
- Frequency. Monthly is frequent enough to connect effort to reward.
- Fairness. Publish how the bonus is calculated and how the pool is divided; consider weighting by attendance so that persistent absence does not earn a full share.
- Complement, not substitute. The bonus cannot replace feedback. If team leaders are appointed, they should give individual recognition weekly; the group bonus handles collective performance, recognition handles individual effort.
Judgement. The group bonus is directionally right for interdependent work but should be introduced as a pilot for three months with a published baseline, so its effect on scrap and attendance can be measured before it becomes permanent. Introducing it simultaneously with the new team leaders would make it impossible to attribute any improvement to either change.
3. The finance director argues the shift 'already has a supervisor'. How should the plant manager respond, and what would make the proposal persuasive?
Read the worked answer
Reframe the objection. The finance director is treating supervision as a binary: either a supervisor exists or one does not. The relevant question is whether the existing structure delivers the supervisory functions the shift needs, and the data says it does not. The plant manager should accept the finance director's framing of cost and answer it on cost grounds, not on principle.
Build the cost case.
- Absenteeism. Reducing nights from 14% to the day-shift level of 5% recovers roughly 5.4 shifts a week across 60 staff, which is over 250 shifts a year of productive capacity.
- Scrap. A 40% reduction in the scrap gap on a precision line is directly measurable in material and rework cost; the plant manager should obtain the actual scrap value per shift.
- Turnover. At 30% turnover, about 18 leavers a year; reducing this by a third saves six recruitments, each with a calculable cost in advertising, induction and time to competence.
- Avoided management cost. Kamal's time currently goes to fault-fixing. If team leaders absorb first-line problem solving, Kamal can plan and coordinate, which is the job he is paid for.
Set a decision rule. Propose a 12-month pilot with two team leaders, measured against a pre-agreed baseline on absence, scrap and turnover, with a review at six months and continuation conditional on stated thresholds. This converts an argument about belief into a test with an exit route, which is usually what a finance director actually wants.
Address the real risk. The finance director may be right that the posts will fail if authority is not delegated. The plant manager should therefore pair the proposal with a written delegation of authority: team leaders may stop a machine, reassign operators and approve short absence, up to defined limits.
Conclusion. The persuasive case is not 'we need more supervisors' but 'we have a measurable problem, here is its cost, here is a bounded intervention with a review gate'. That respects the finance director's concern while keeping the decision on the evidence.