CMA Sri Lanka SL1 Strategic Management Accounting Exam common mistakes
CMA Sri Lanka SL1 Strategic Management Accounting Exam · Understand the traps and how to avoid them.
When asked to recommend a production plan under a limiting factor, the candidate ranks products by highest unit contribution or highest unit selling price instead of contribution per unit of the scarce resource, and then reports the resulting total contribution as optimal.
Candidates carry over absorption-costing habits from earlier studies, where a product's apparent profitability is driven by selling price minus full unit cost. They see 'most profitable product' and reach for the biggest contribution figure without re-expressing it per machine hour, per labour hour, or per kilogram of material. The exam deliberately supplies products with high unit contribution but heavy resource consumption, so the intuitive ranking is wrong.
What to do instead
Before ranking, write the scarce resource in the denominator: contribution per limiting factor = unit contribution / units of scarce resource per unit of product. Rank descending on that ratio, allocate the resource top-down, and only then compute total contribution. When demand limits exist, allocate up to maximum demand for the top-ranked product before moving to the next. Show the ranking table in the answer so the marker can see the basis. For multi-resource problems, state explicitly that linear programming is needed and identify the binding constraints and the point of intersection of the binding constraint lines.
The candidate mixes up the high-low method's numerator and denominator, or applies it to data containing an outlier or a step cost, and then uses the resulting cost function to forecast outside the observed activity range without comment.
High-low is taught as a mechanical formula, so candidates select the highest and lowest cost observations rather than the highest and lowest activity observations, or they use all data points as if the method were regression. Step costs and outliers are common in the exam data precisely to test whether the candidate inspects the data before applying the technique. Extrapolation feels harmless because the arithmetic still produces a number.
What to do instead
Always select observations by activity level, not by cost. Plot or tabulate the data first and flag any point that is a step change, an outlier, or a one-off (for example a month with a strike or a machine breakdown); exclude it and justify the exclusion in one sentence. State the relevant range of the resulting cost function and note explicitly that forecasts beyond it are unreliable. If asked to compare methods, say that regression uses all observations and provides measures of fit, whereas high-low uses two points and is sensitive to their selection.
In activity-based costing, the candidate calculates a single plant-wide or departmental recovery rate, or allocates all overhead to products on direct labour hours, even where the question describes diverse products and multiple activities with identifiable cost drivers.
Candidates default to the absorption-costing template they have practised most. They also confuse cost drivers with allocation bases, choosing the base that is easiest to measure (labour hours) rather than the factor that actually causes the cost. Under time pressure, setting up an activity-cost pool table feels slow, so the single-rate shortcut is tempting.
What to do instead
Build the ABC answer as a table: activity, cost pool, cost driver, total driver quantity, rate per driver, then driver quantity per product. Ask of each pool 'what causes this cost to rise?' and use that as the driver. Finish by comparing the ABC product costs with the simple absorption costs and explain the cause of the difference: high-volume simple products are usually over-costed and low-volume complex products under-costed. If asked for a recommendation, link the cost distortion to pricing or product-mix consequences, not just to the numbers.
The candidate prepares a cash budget by entering sales revenue and purchase cost rather than cash receipts and cash payments, ignoring credit terms, bad debts, depreciation and other non-cash items, and omitting the opening or closing cash balance check.
The word 'budget' triggers a profit-planning mindset. Candidates reproduce figures from the sales and purchases budgets directly into the cash budget because it is faster and looks consistent. Non-cash items such as depreciation are copied in from the cost data. The timing effect of debtors' and creditors' payment patterns is the actual skill being tested, and it is the step most often skipped.
What to do instead
Start the cash budget from a receipts schedule and a payments schedule, each laid out by month of cash movement, applying the collection pattern (for example 60% in the month of sale, 40% the next month) and deducting bad debts before any cash is recognised. Exclude depreciation, provisions, and write-offs entirely. Add capital expenditure, tax, dividend and loan repayments from the question. Compute the closing balance each month and carry it forward as the next month's opening balance, and check any minimum cash requirement to identify the financing need.
In variance analysis, the candidate computes variances with the wrong sign convention or reverses the standard and actual quantities, then labels an adverse variance as favourable, and stops at the calculation without explaining the operational cause of the variance.
Different textbooks use different sign conventions, and candidates learn one and apply it inconsistently under exam pressure. The material price variance in particular is often computed as (standard price minus actual price) times actual quantity in one place and the reverse elsewhere. Candidates also treat the variance as the answer rather than as evidence requiring interpretation, because the arithmetic is what they rehearsed.
What to do instead
Fix one convention at the start of the script and write it down: for each variance, state the formula in words before substituting. Use the memory aid that a price variance is valued at actual quantity and a usage variance at standard price. Label every result A or F explicitly and sanity-check the direction: paying more than standard is adverse. Then add one or two sentences on likely causes drawn from the scenario (a new supplier, a less experienced workforce, a machine fault) and state whether the variance is controllable and by whom. Where variances interact (for example a cheaper material causing more waste), say so rather than treating them as independent.
When answering a pricing question, the candidate applies full cost plus a markup and presents it as the price, without considering the relevant costs for a one-off order, the elasticity of demand, competitor reaction, or the capacity position of the business.
Cost-plus is the only pricing method candidates can execute mechanically, so it becomes the default answer to every pricing question. The scenario often contains the information needed for a marginal-cost or target-return decision, but candidates do not recognise that a special order should be priced on incremental cost where spare capacity exists. They also treat the markup percentage as given rather than as something that must reflect demand and competition.
What to do instead
Classify the decision first: is this a normal long-run price, a one-off special order with spare capacity, a tender, or a new product launch? For a special order with spare capacity, price on relevant (incremental) cost and state that fixed costs already covered are irrelevant, while warning that the price must not undermine the normal market. For new products, use target costing: start from the price the market will bear, subtract the required margin, and derive the allowable cost. For cost-plus, compute the markup on the intended base (marginal cost, full cost, or investment) and explain how competition and demand elasticity constrain the result.
In transfer pricing, the candidate states that the correct transfer price is full cost plus a percentage, or that the general rule is 'whatever the two divisions agree', without identifying the minimum price the selling division will accept, the maximum the buying division will pay, and whether the transferring division has spare capacity.
Candidates learn a formula for cost-based transfer prices and apply it regardless of the capacity situation, which is the variable that actually determines the answer. The opportunity cost logic is abstract and is often memorised as a phrase rather than understood, so it collapses when the question adds an external market for the intermediate product.
What to do instead
Set out the two boundaries every time: the minimum transfer price is the transferring division's variable cost plus any lost contribution from external sales displaced; the maximum is the external purchase price the buying division would otherwise pay. Then apply the capacity test: with spare capacity the minimum is variable cost and the range is widest; at full capacity the minimum rises to the external market price and there may be no range, so internal transfer destroys group profit. Conclude with the group-optimal decision and, where relevant, note the behavioural and performance-measurement consequences of the chosen price.
The candidate treats a division's return on investment and residual income as interchangeable, or improves ROI by discouraging an investment that would lower the division's ROI but increase group value, without recognising the goal-congruence problem.
Both measures are computed from the same divisional profit and asset figures, so candidates see them as two ways of saying the same thing. The conflict between divisional and corporate interests is the conceptual point of the topic and is easy to state in the abstract but hard to spot inside a numerical scenario, where the candidate simply computes both figures and moves on.
What to do instead
Compute both, then compare the investment's own return with the division's current ROI and with the company's cost of capital. Show that a project returning more than the cost of capital but less than the division's current ROI will be rejected under ROI while accepted under residual income, and explain that residual income therefore aligns divisional managers with group interests. State explicitly which measure you would use and why, and note the drawback of residual income (it is an absolute amount, so it is harder to compare divisions of different size).
When a decision involves uncertainty, the candidate computes expected value and recommends the option with the highest expected value, ignoring risk attitude, the spread of outcomes, and the fact that a risk-averse decision maker may prefer a lower expected value with less downside; or the candidate confuses maximin, maximax and minimax regret.
Expected value is the one quantitative technique candidates can compute confidently, so it becomes the whole answer. The decision criteria are memorised as labels without a consistent frame: maximin is confused with minimax, and regret is computed against the wrong benchmark. Candidates also overlook that expected value is a long-run average that may be inappropriate for a one-off, high-stakes decision.
What to do instead
Tabulate the payoffs by decision option and state of nature first. Then compute each criterion explicitly: maximin picks the best of the worst outcomes, maximax picks the best of the best, minimax regret builds a regret table by subtracting each payoff from the best payoff in its column and then minimises the maximum regret. Compute expected value only when probabilities are given, and add a sentence on the range of outcomes and the decision maker's attitude to risk. Conclude with a recommendation that names the criterion used and why it fits the scenario.
The candidate answers a strategic decision-making question by listing generic tools (SWOT, PESTEL, Porter's five forces) with one-line definitions, without applying them to the specific facts in the scenario, and without reaching a quantified recommendation.
Model answers in study texts present frameworks as checklists, so candidates reproduce the checklist to show knowledge. The exam rewards application and judgement, and candidates underestimate how much of the mark lies in linking analysis to a decision and its financial consequences. Time pressure pushes them towards listing rather than reasoning.
What to do instead
Use the framework as a structure for the argument, not as the answer: for each element, state the specific fact from the scenario and its consequence for the decision. Quantify wherever the data allow, for example the financial effect of each option, breakeven volumes, or the cost of the preferred course. Close with a clear recommendation, the key assumptions behind it, the main risk, and what information would change the decision. Aim for a reasoned judgement in every paragraph rather than a definition in every paragraph.