What it means
If activity-based costing tells you what work truly costs, activity-based management is the decision-making that follows. It splits into two uses.
Operational ABM hunts for waste, asking which activities add no value and how to do the valuable ones better, while strategic ABM asks which products, customers and channels actually make money once activities are priced honestly. The findings routinely surprise.
Products that looked profitable under average overhead allocation turn out to consume disproportionate set-up, handling and support, while quieter products quietly subsidise them. Customer profitability reshuffles in the same way, because a demanding small customer who phones weekly, orders erratically and returns goods often can cost more to serve than the customer pays.
Acting on the numbers is the hard part. Options include repricing, redesigning the product, changing how customers order, or dropping an activity altogether, and each carries organisational costs.
Teams whose work looks wasteful need redeployment plans, or the next round of data collection will meet silence. ABM pairs naturally with continuous improvement.
Because activities are named and measured, a team can target the costliest ones, change the process and watch the unit cost fall in the next cycle. Benchmarks also gain meaning, since comparing your cost per order processed with another firm's becomes possible once the unit of work is defined instead of buried in headcount.
The method is not free. Maintaining activity models takes effort, and stale driver data turns sharp analysis into confident fiction, so the model needs an owner and a refresh rhythm.
The first model will be wrong in useful ways, so treat version one as a probe rather than a monument. For a manager, the entry point is modest.
Pick one product line or customer segment, cost the ten activities it consumes, and compare the answer to the margin your accounts currently show. It pays most where overhead is large and varied, such as diversified service businesses, and teaches little in a lean firm with one product.
In practice
Real-world examples.
Example
A manufacturer costs the activities behind each product family and finds that its premium line consumes three times as many engineering changes as standard lines. Repricing the change process restores the margin the old accounts had hidden.
Example
A bank prices its account-servicing activities and discovers that its smallest business customers generate less income than their service costs. It designs a self-service tier instead of losing the customers.
Example
A hospital maps the activities in its patient discharge process. Cutting duplicate documentation shortens stays by half a day, which releases beds without adding capacity.
Formula
Calculation
Activity cost = Driver volume x Cost per driver unit. Customer profit = Gross margin from the customer - Sum of the activity costs it consumes.
Worked example. A fictional supplier earns a gross margin of $3,500 a year from a small customer. That customer places 40 orders at $30 each, makes 52 support calls at $25 each, and returns goods 10 times at $150 each. Order cost = 40 x $30 = $1,200. Support cost = 52 x $25 = $1,300. Returns cost = 10 x $150 = $1,500. Total activity cost = $1,200 + $1,300 + $1,500 = $4,000. Customer profit = $3,500 - $4,000, a loss of $500, even though the accounts show a positive gross margin.Case study
Seen in the real world.
This case study is fictional and illustrative. The operations director of Kestrel Components, an invented supplier, prices the activities behind the firm's top fifty customers and finds that the fifth-largest barely breaks even. The account looks impressive on sales volume, but it demands daily small shipments, rush orders and constant changes to delivery dates.
She restructures its ordering into monthly consolidated shipments with a clear change-notice fee. The account turns profitable without a price rise, and the customer, whose own costs fall, agrees to a longer contract.
The same activity file later informs pricing for two new contracts, and the firm adds activity costs to its monthly management pack beside revenue so that the analysis does not fade from memory within two quarters.
Watch out
Common mistakes.
- Building the costing model and never acting on it. ABM is a management practice, and the value lives in the changes, not the spreadsheet.
- Using activity costs as weapons against teams. If people expect their work to be labelled wasteful with no plan for them, data collection will meet silence.
- Letting driver data go stale. Activity models decay, and last year's unit costs mislead this year's decisions.
Questions
People also ask.
How does ABM differ from ABC?
ABC (activity-based costing) measures what activities cost. ABM uses those measurements to manage, by cutting waste, repricing, redesigning processes and choosing which customers to serve.
Where should a company start?
With one painful question, usually a product line or customer segment of doubtful profitability, costed at activity level.
Does it suit service businesses?
Especially. Services are almost pure activity cost, so the distortions ABM fixes are largest there, and overhead-heavy services often find that the offerings they thought were profitable are not.
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