UEP: the production effort unit method
UEP stands for unidade de esforço de produção, the production effort unit. It is a costing method that answers an awkward question with surprising elegance: how do you measure the output of a factory that makes dozens of different products through the same shared operations? Standard costing struggles with it. Activity-based costing can do it, at a cost. UEP solves it by inventing a single, abstract unit of "production effort" and expressing every product, however different, as a number of those units. In effect, it turns a multi-product factory into a single-product factory.
The idea is French, the development is Brazilian, and the method is today far more widely taught and used in Brazil than anywhere else, especially among multi-product manufacturers. This profile traces where UEP came from, how it actually works, and where it earns its keep, drawing on the Brazilian academic literature that has studied it for nearly forty years.
the UEP method (unidade de esforço de produção, production effort unit) measures the output of a multi-product factory in a single abstract unit of production effort, so that heterogeneous products become comparable as if the plant made only one thing. Each work centre (posto operativo) is given an hourly cost index, a reference product fixes the value of one UEP, and every product is then expressed as a number of UEPs. The method, derived from the GP method of the French engineer Georges Perrin and developed in Brazil by Franz Allora and the production-engineering schools of UFSC and UFRGS, is strong at unifying output, measuring productivity and capacity, and is simple to run once built. Its main limit is that it costs only transformation, leaving out raw materials and structural overhead, and it assumes the effort relationships between work centres stay stable over time. ---
Where it came from: France, then Brazil
The intellectual root is the GP method (méthode GP, for Georges Perrin), created by the French engineer Georges Perrin (1891 to 1958), a graduate of the École Centrale. Perrin conceived the approach in the late 1930s, had it working by the mid-1940s, and promoted it through the 1950s. After his death in 1958 his widow, Suzanne Perrin, ran the consultancy that carried his name and published his book, Prix de revient et contrôle de gestion par la méthode GP (Dunod), in the early 1960s. Perrin's central insight was the idea of a stable, non-monetary unit of "effort": the relative effort that different operations demand of a factory stays roughly constant over time, even as prices move, so effort can be used as a unit of measure. In France the lineage later evolved into the UVA method (unités de valeur ajoutée).
The Brazilian chapter begins with Franz Allora, an Italian engineer and follower of Perrin, who brought the method to Brazil in the early 1960s, adapted it and renamed its unit the UP and then the UEP. From 1978 Allora implemented it in firms around Blumenau and Joinville, in Santa Catarina, through his consultancy. What turned a consulting technique into an academic discipline was the interest of Brazil's production-engineering schools from the mid-1980s. Antonio Cezar Bornia, at the Universidade Federal de Santa Catarina (UFSC), wrote the foundational master's dissertation analysing the method's principles in 1988, and Francisco José Kliemann Neto, at the Universidade Federal do Rio Grande do Sul (UFRGS), developed and taught it as well. Disseminated through the Brazilian cost accounting congress (Congresso Brasileiro de Custos) and a steady stream of theses and papers, UEP became, and remains, a standard part of the Brazilian cost-management curriculum.
How it works
UEP costs only the transformation of materials into product, the production effort. It deliberately leaves raw materials and structural expenses to one side and deals with them separately. The build has five classic steps, following Bornia.
A work centre is a set of one or more elementary operations that are homogeneous: every product passing through is subject to the same kind of effort, differing only in how long it takes. A work centre is not necessarily a machine; it is a unit of homogeneous effort.
This is the cost per hour of running that work centre, in money, built from labour, energy, maintenance, depreciation and the other transformation costs that the centre consumes. Crucially, it excludes raw materials and structural overhead.
A reference product, which can be real, a combination, or a representative construct, is run through the plant on paper. Its cost is built by multiplying its time in each work centre by that centre's hourly index and summing. That figure becomes the value of one UEP. The reference product cushions individual variations and anchors the whole system.
Dividing a centre's hourly index by the reference cost expresses how much effort, in UEPs, that centre generates per hour of operation. These ratios are the heart of the method.
Multiply each product's time in each work centre by that centre's productive potential and sum across the route. The result is the product's value in UEPs, a single number that captures all the transformation effort it demands.
Once the model is built, running it each period is simple. Multiply each product's UEP value by the quantity produced and add up to get total output in UEPs. Divide the period's actual transformation cost by that total to get the money value of one UEP this period. Multiply back to get each product's transformation cost. Raw materials are then added on top, separately. Because the UEP values themselves are independent of money, they stay stable while the monetary value per UEP flexes with actual costs each period.
A worked example
To make the arithmetic concrete, take an illustrative plant we will call CaP Manufacturing (the figures are illustrative, used only to show the method). It runs three work centres and makes several products.
| Work centre | Hourly cost index (illustrative) |
|---|---|
| Cutting | EUR 60 per hour |
| Assembly | EUR 90 per hour |
| Finishing | EUR 45 per hour |
Suppose the reference product takes 0.10 h in cutting, 0.20 h in assembly and 0.10 h in finishing. Its reference cost is (0.10 x 60) + (0.20 x 90) + (0.10 x 45) = 6 + 18 + 4.5 = EUR 28.50. That EUR 28.50 is now the value of one UEP.
Each work centre's productive potential (UEPs per hour) is its index divided by 28.50: cutting 2.11, assembly 3.16, finishing 1.58 UEPs per hour.
Now take product A, which needs 0.05 h cutting, 0.30 h assembly, 0.20 h finishing. Its UEP value is (0.05 x 2.11) + (0.30 x 3.16) + (0.20 x 1.58) = 0.105 + 0.948 + 0.316 = 1.37 UEPs.
If the plant produces 10,000 of product A and other products totalling, say, 50,000 UEPs of output in the period, and the period's actual transformation cost was EUR 1,400,000, then one UEP is worth 1,400,000 / 50,000 = EUR 28.00 this period. Product A's transformation cost is 1.37 x 28.00 = EUR 38.36, to which its raw material cost is added separately. The same machinery gives you output, productivity and capacity in a single comparable unit across every product the plant makes.
The headline strength is unification. A plant that makes dozens of different things suddenly has one honest measure of how much it produced, how productively, and how close it ran to capacity. That makes period-to-period comparison, benchmarking between lines and product-mix analysis straightforward in a way that physical units (tonnes, pieces) never allow when the products are genuinely different.
It is also cheap to operate once built. Because the UEP values are stable and money-independent, the ongoing model needs only the period's cost total and the period's production quantities. It does not require the continuous activity surveys that made classic ABC so expensive. And it yields operational measures, efficiency, capacity utilisation, productivity, that production engineers, not just accountants, can use.
The defining limitation is scope: UEP costs only transformation. It does not allocate raw materials, which it handles separately, and it ignores structural and overhead expenses (despesas de estrutura), the costs of selling, administration and the parts of the business that sit outside the production floor. For a company where those costs are large or where the real profitability question is about customers and channels rather than the factory, UEP answers only part of the question.
Its second weakness is the assumption it rests on: that the effort relationships between work centres stay constant. This is the method's own founding principle, and it holds well in a stable plant. But a significant change in process or technology can shift those relationships, and the model then has to be rebuilt. UEP is also a poor fit for services and commerce, where there is no homogeneous production effort to measure, and it can struggle to handle losses and waste cleanly. Building the model in the first place is laborious.
Where it fits
UEP earns its place in multi-product manufacturing, where shared operations turn out many different items and management needs a single, stable measure of output and productivity. The Brazilian literature documents applications across textiles, footwear, food (pasta, biscuits, dairy, poultry), ceramics, furniture, cosmetics and metal-mechanical work, typically in small and medium-sized industrial firms. It is not a method for service businesses, and it is rarely the right tool when the central question is customer or channel profitability, which is the territory of cost-to-serve and time-driven activity-based costing.
FAQ
What does UEP stand for?
UEP stands for unidade de esforço de produção, Portuguese for "production effort unit". It is the single abstract unit in which the method measures all of a factory's output, so that products which are physically very different become comparable.
Who invented the UEP method?
The underlying GP method was created by the French engineer Georges Perrin in the 1940s. It was brought to Brazil and developed into the UEP method by the Italian engineer Franz Allora from the early 1960s, and was then studied and formalised by Brazilian academics, notably Antonio Cezar Bornia at UFSC and Francisco José Kliemann Neto at UFRGS, from the mid-1980s.
How is UEP different from ABC?
UEP measures production effort and costs only the transformation of materials into product, using a single effort unit. Activity-based costing traces all overhead, including support and structural costs, to activities and then to products and customers. UEP is simpler and stronger for shop-floor productivity in multi-product plants; ABC is broader and better for customer and channel profitability. See the full comparison at /methods/uep-vs-abc/.
Does UEP include raw materials?
No. UEP deliberately costs only transformation effort. Raw materials are added separately on top of the UEP-based transformation cost, and structural or overhead expenses are left out of the UEP calculation altogether. This is the method's main limitation as a complete costing system.
Is the UEP method still used?
Yes, particularly in Brazil, where it is taught in production-engineering and accounting programmes and applied in multi-product manufacturing, especially small and medium-sized firms. It is far less common outside Brazil, though its French ancestor survives there as the UVA method.
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