Define the system and unit of analysis
Specify process, population, product, time window, boundaries and aggregation level. Without a defined unit of analysis, measures and comparisons may represent different phenomena.
TECHNICAL GUIDE · STRUCKEL TOOLS
PRC-01 · Processes
SIPOC — High-Level Process View
Frames an end-to-end process at executive level by connecting suppliers, inputs, macro steps, outputs and customers before detailed mapping.
SIPOC · fornecedores · entradas · processoFormulários Struckel
01
MANAGEMENT QUESTION
The problem the tool must make decidable.
Before opening a form, define the question that must be answered. A management tool is useful when it reduces ambiguity, exposes assumptions and makes clear which decision will be made from the evidence produced.
PRC-01What is the real process boundary and which supplier–input–process–output–customer relationships must exist to deliver the outcome?
Process tools make boundaries, inputs, outputs, risks and responsibilities visible. This reduces the classic mistake of optimizing one step while moving the problem elsewhere in the flow.
Use them when the challenge crosses functions, depends on handoffs, contains operational risk or requires standardization and clarity about how work actually happens.
02
METHOD ARCHITECTURE
Technical construction: from operational definition to evidence.
A map reveals relationships that are difficult to see in lists. First define the object and the boundary; then position elements using one consistent criterion. Mixing levels of detail or different criteria destroys readability.
Define criteria before evaluation
Translate abstract concepts into operational definitions, scales, classification rules and data sources. Criteria should exist before the result to reduce retrospective interpretation.
Preserve traceability
Link each conclusion to data, observations, assumptions and owners. When a score is used, retain its components; when a hypothesis is used, record how it will be tested.
When analyzing, look for gaps, concentration, conflicts, loops and disconnected elements. The value of the map is not aesthetic; it lies in the questions it makes possible about the system.
03
WORKED EXAMPLE
How the method behaves in a real situation.
For an order-to-invoice process, SIPOC can start at approved order and end at invoice issuance. Critical inputs include master data, price and tax conditions; an output CTQ may be “invoice correct on first issue.”
The example is intentionally specific. Numbers illustrate the reasoning and are not universal benchmarks: limits, scales and targets must be defined for the process being analyzed.04
MEASUREMENT AND INTERPRETATION
What to observe so the document does not become mere form filling.
Measures should serve reasoning. Whenever possible combine outcome, process and contextual evidence. For time series, look for patterns and variation rather than only point-in-time before/after comparisons.
01start/end boundary
025–7 macro steps
03output CTQs
04input requirements
05process measures
Consistency test
Ask whether another person, using the same definitions and evidence, would reach a similar interpretation. If the answer depends heavily on individual judgment, refine the operational definition, scale or data source.
05
LIMITATIONS AND GOVERNANCE
The tool supports decisions; it does not replace judgment, context and validation.
Established method/tool in professional and academic literature; exact implementation should be tailored to context.
SIPOC is a high-level view; it does not replace detailed flowcharts, value-stream mapping, time study or causal analysis. Mixing macro steps with micro tasks defeats its framing purpose.
Define an owner, review frequency, official data source and condition for reopening the decision. Link actions to deadlines and indicators, hypotheses to tests, and risks to treatment and follow-up.
DefinitionEvidenceInterpretationDecisionReview
06
METHODOLOGICAL BASIS
References for deeper study of the method.
The references below support the methodological family or principle used. Struckel’s digital implementation operationalizes application, documentation and traceability; it does not change the conceptual limits of the original sources.
ASQ_SIPOC
Open reference American Society for Quality. SIPOC+CM Diagram — Quality Resources.
ASQ_SIPOC_ART
Open reference Johnston M, Dougherty D. Developing SIPOC Diagrams. Six Sigma Forum Magazine. 2012;11(2):14–18.
ISO9001_PROCESS
Open reference ISO/TC 176/SC 2. The Process Approach in ISO 9001:2015.
USE IT IN PRACTICE
Turn the method into a document ready for real work.
Struckel Forms offers a free way to structure this methodology with guided fields, contextual help and print/PDF preparation. Use the tool to organize reasoning; use consulting when the challenge requires design, implementation, facilitation or executive follow-up.