Design & RSM
Advanced experimental designs including Factorial, Response Surface, and Custom methods.
Predictive Models
Neural networks, AI, and machine learning algorithms for advanced predictive modelling.
DOE Framework
From planning through screening, modelling, optimisation, and utilisation.
Design Of
Experiments
Data-driven insights. Optimised processes. Enhanced quality control.
At EnerTherm Engineering, our Design of Experiments (DOE) services empower businesses to systematically explore and optimise the factors influencing their processes. By testing and analysing multiple variables, our DOE approach uncovers critical insights, enhancing process control, product consistency, and operational efficiency.

What Is Design Of
Experiments (DOE)?
Design of Experiments (DOE) is a systematic methodology used to identify the relationships between factors affecting a process and the output of that process. It involves planning, conducting, analysing, and interpreting controlled tests to evaluate how various factors control the value of a parameter or group of parameters. DOE is essential in fields such as engineering, manufacturing, and biology for optimising processes, improving product design, and enhancing quality control.
Randomisation
Randomly assigning experimental units to treatment groups to mitigate effects of uncontrolled variables and biases.
Replication
Repeating experiments to estimate variability in data and ensure consistent, reliable results.
Blocking
Grouping similar experimental units together to reduce variability and increase accuracy of experiments.
Factorial Designs
Evaluate the effect of multiple factors and their interactions simultaneously.
Response Surface Methods
Find optimal operating conditions for complex processes with multiple variables.
Custom Designs
Tailored experimental designs for specific investigations and levels of complexity.
Industry-Specific
DOE Applications
Tailored experimental design for your sector — every industry has unique variables to optimise.
Automotive
- ·Engine parameter optimisation
- ·Paint cure process DOE
- ·Assembly line efficiency
Chemical Processing
- ·Reaction yield optimisation
- ·Catalyst screening studies
- ·Process variable analysis
Energy Production
- ·Combustion optimisation
- ·Turbine performance DOE
- ·Emission reduction studies
Food & Beverage
- ·Recipe optimisation
- ·Shelf life studies
- ·Process parameter tuning
Pharmaceutical
- ·Formulation optimisation
- ·QbD implementation
- ·Process validation DOE
Semiconductor
- ·Wafer process optimisation
- ·Yield improvement DOE
- ·Deposition parameter studies
Our 8-Step
DOE Framework
A structured methodology from planning through screening, modelling, optimisation, and utilisation of results.
Planning
Define clear objectives, success criteria, and measurable KPIs that align the experiment with your broader engineering and business goals.
Identify all relevant factors and their operational levels, establish measurement system reliability through Gauge R&R studies, and define statistical control boundaries. A robust plan ensures resources are allocated efficiently and that every test run produces actionable data.
Screening
Run targeted preliminary experiments to separate the critical few factors from the trivial many, drastically reducing experimental scope.
Leverage Fractional Factorial, Plackett-Burman, or Definitive Screening Designs to evaluate dozens of potential variables in a fraction of the runs a full factorial would require. The deliverable is a ranked Pareto chart of factor significance, enabling your team to focus resources on the variables that truly drive performance.
Modelling
Construct a rigorous mathematical model — typically a polynomial regression — that quantifies how significant factors and their interactions drive your response variable.
Apply Full Factorial or Response Surface designs to capture main effects, two-way interactions, and curvature. The resulting model is validated with ANOVA, residual diagnostics, and R-squared metrics to ensure it reliably predicts system behaviour across the design space.
Optimisation
Fine-tune factor settings using response surface methodology to pinpoint the operating conditions that maximise yield, quality, or efficiency.
Deploy Central Composite or Box-Behnken Designs to map the response surface and locate global optima, even in the presence of complex factor interactions. Multi-objective optimisation techniques such as desirability functions are applied when balancing competing performance targets like cost versus quality.
Verification
Execute confirmation runs under the predicted optimal conditions to validate that the model accurately reflects real-world process behaviour.
Compare observed responses against model predictions using confidence and prediction intervals to assess agreement. If deviations exceed acceptable thresholds, the model and optimisation parameters are iteratively refined until robust, repeatable performance is confirmed.
Execution
Carry out each experimental run according to the randomised design matrix, maintaining strict control over environmental conditions and procedural consistency.
All relevant process parameters, environmental readings, and response measurements are recorded in structured data logs with full traceability. Randomisation and blocking strategies are enforced to guard against systematic bias, ensuring the collected dataset is statistically sound.
Analysis
Apply statistical analysis — including ANOVA, effect plots, and contour maps — to extract meaningful patterns, interactions, and correlations from the experimental data.
Beyond classical statistics, advanced predictive models are built using neural networks (SANN), machine learning algorithms, and AI-driven pattern recognition. These complementary techniques uncover non-linear relationships that traditional regression may miss, delivering deeper process understanding.
Utilisation
Translate experimental insights into concrete process improvements, updated specifications, and operational best practices that drive measurable business value.
A comprehensive report documenting the experimental design, statistical findings, and recommended operating windows is delivered to all stakeholders. Knowledge is embedded into SOPs, control plans, and continuous improvement frameworks to ensure long-term retention and replication across projects.
Why Invest In
DOE Services?
Achieve significant improvements in product quality, process efficiency, and overall operational effectiveness.
Systematic Exploration of Variables
- Investigate multiple factors simultaneously for improved performance
- More efficient than traditional one-factor-at-a-time (OFAT) methods
Optimisation of Processes & Products
- Enhance quality, reduce costs, and increase efficiency
- Find the best settings for multiple variables that influence desired outcomes
Reduction of Defects & Variations
- Identify root causes of defects and variations in processes
- Develop strategies to mitigate issues, improving overall quality and consistency
Interaction Analysis
- Analyse interactions between variables to reveal complex relationships
- Crucial insight for optimising multifactorial systems beyond OFAT methods
Enhanced Decision Making
- Use DOE with CFD and FEA to reduce design iterations
- Make informed decisions on process adjustments for robust operations
Continuous Improvement & Validation
- Integral to methodologies like Six Sigma for process excellence
- Gather data on process performance and determine critical parameters
DOE In
Action
Real-world results from our Design of Experiments engagements across industries.
Frequently Asked Questions
Common questions about our Design of Experiments methodology, experimental designs, and expected outcomes.
Ready to
Optimise?
Our engineering team is ready to apply Design of Experiments methodology to your processes, from planning through to analysis and implementation.
- Systematic multi-variable process optimisation
- AI & ML-powered predictive modelling
- Integration with CFD & FEA for comprehensive analysis