12 Practical Strategies for Architects
Introduction
Cost is one of the most important considerations in architectural design. A building must satisfy the client’s requirements, respond to its site and climate, provide comfortable spaces, and comply with applicable regulations—all within an agreed budget.
However, reducing building costs does not simply mean selecting cheaper materials or reducing room sizes. Many expensive construction problems originate much earlier, when the building’s form, structural system, circulation, service routes, and material specifications are being developed.
A poorly coordinated design may lead to unnecessary structural complexity, excessive material consumption, difficult construction details, procurement delays, and expensive changes on site. Conversely, a well-planned building can use space, materials, labour, and building services more efficiently.
Cost reduction in building design is the systematic process of lowering the initial and long-term costs of a building by improving planning, geometry, structural efficiency, material selection, construction methods, and coordination while maintaining required safety, functionality, durability, accessibility, and environmental performance.
For architects, the objective is not to produce the cheapest possible building at any cost. It is to deliver the required building performance with the best achievable value over the building’s useful life.
1. What Is Cost Reduction in Building Design?
Cost reduction in building design involves identifying and eliminating unnecessary expenditure through informed architectural and engineering decisions.
It begins with understanding the client’s requirements, establishing a realistic budget, evaluating design alternatives, and coordinating the work of all consultants before construction begins.
The process considers two related financial perspectives:
- Initial cost: Expenditure on design, approvals, materials, labour, construction, equipment, and other project-specific items.
- Life-cycle cost: The cost of acquiring, operating, maintaining, repairing, replacing, and eventually disposing of a building or its components over a defined study period.
A design with a lower initial cost may require more maintenance or consume more energy. An alternative with a higher initial cost may offer better long-term value. Life-cycle cost analysis helps compare alternatives that provide equivalent required functions and performance.
The Whole Building Design Guide explains that life-cycle cost analysis should be undertaken early enough for design alternatives to be evaluated before major decisions become difficult or expensive to change.
2. Why Is Cost Reduction Important in Architecture?
Cost-conscious design helps architects make better decisions about space, structure, construction, and building performance.
Its principal objectives are to:
- Keep the proposed design within the client’s financial capacity.
- Eliminate unnecessary construction quantities and design complexity.
- Improve the efficiency of usable floor area.
- Reduce material wastage and avoidable rework.
- Simplify structural systems and construction details where appropriate.
- Coordinate architectural, structural, and building-services requirements.
- Improve the balance between capital cost and operating expenditure.
- Maintain safety, accessibility, comfort, and regulatory compliance.
- Reduce avoidable construction delays and changes.
- Achieve durable, maintainable and resource-efficient buildings.
The most effective cost-saving decisions are usually made while alternatives can still be compared during briefing and early design.
3. Twelve Methods for Reducing Cost in Building Design
3.1 Establish a Clear Client Brief and Budget
The first step is to establish exactly what the building must achieve.
Before developing detailed drawings, the architect should clarify the required accommodation, quality level, operational needs, future expansion, completion date, and available budget.
A useful brief identifies essential requirements separately from optional features.
For example, a residential client may require three bedrooms, adequate daylight, cross-ventilation where feasible, accessible circulation, and sufficient storage. Premium imported finishes or elaborate decorative features may be optional rather than essential.
This distinction helps the design team protect the project’s functional requirements while evaluating discretionary expenditure.
Practical measures:
- Prepare an accommodation schedule.
- Confirm the target floor area and quality level.
- Identify statutory and safety requirements.
- Establish a preliminary cost plan.
- Agree on the approval process for design changes.
- Identify a suitable contingency based on project risks and estimate maturity.
A realistic budget must include the applicable project costs, not just the visible building work. Depending on the project, these may include consultant fees, approvals, external development, utility connections, taxes, specialist systems, and contingencies.
3.2 Optimize the Building Plan and Floor Area
Efficient planning can reduce construction quantities without compromising the usefulness of the building.
The architect should examine whether each space is appropriately sized and positioned, whether circulation is efficient, and whether rooms can share facilities or service zones.
Consider a residential building in which a long, indirect passage occupies a significant area but serves only two bedrooms. A revised layout may shorten the passage and improve the relationship between bedrooms, bathrooms, and living spaces.
The saved area may reduce floor finishes, ceiling work, wall finishes, and other area-dependent costs. However, the final saving depends on what is actually removed from the design and the associated construction quantities.
Planning strategies include:
- Avoid oversized rooms that do not serve a clear function.
- Reduce unnecessary corridors and circulation dead ends.
- Group spaces according to their functional relationships.
- Coordinate furniture layouts with room dimensions.
- Use repeated room modules where they suit the brief.
- Arrange wet areas to support efficient plumbing routes.
- Design storage into the plan rather than adding it later.
- Preserve adequate accessibility, ventilation, and daylight.
Do not reduce room dimensions blindly. An undersized room can impair furniture placement, movement, usability, and future adaptability.
3.3 Choose an Economical Building Shape
The overall building form influences the quantity of external wall, roofing, façade treatment, foundations, and sometimes structural and building-services work.
For a simple building with a fixed floor area, an unnecessarily irregular perimeter may require more external wall construction and more complicated junctions than a compact alternative.
For example, a square or near-rectangular floor plate generally has a shorter perimeter than an elongated rectangle of the same area. A shorter perimeter can reduce the amount of external wall and façade required, all else being equal.
Nevertheless, compactness is not the only design criterion. Daylight, orientation, natural ventilation, views, site setbacks, fire safety, circulation, and the building’s intended use may justify a different form.
Architectural recommendations:
- Compare alternative massing options at the concept stage.
- Minimize unnecessary projections and recesses.
- Coordinate façade modules and structural grids.
- Avoid roof geometry that adds complexity without sufficient functional benefit.
- Use simple junctions and repeatable details where appropriate.
- Consider climate-responsive shading before finalizing the envelope.
An economical building form is not necessarily a plain box. It is a form in which additional complexity has a clear architectural, functional, environmental, or contextual purpose.
3.4 Develop an Efficient Structural System
Structural design is a major area where coordination can prevent avoidable expenditure.
The architect and structural engineer should establish a compatible planning grid, column arrangement, floor-to-floor height, and structural system early in the design process.
A regular structural grid can simplify formwork, reinforcement detailing, repetition, and construction sequencing. However, the appropriate grid depends on the building’s use, spans, loads, soil conditions, seismic requirements, and the selected structural system.
Cost-effective structural planning may involve:
- Aligning columns between floors wherever practical.
- Avoiding unnecessary transfer structures and abrupt structural changes.
- Coordinating columns with walls, partitions, parking, and room layouts.
- Rationalizing beam and slab arrangements.
- Reviewing spans and floor systems with the structural engineer.
- Coordinating openings and sleeves before structural drawings are finalized.
- Avoiding late changes to columns, beams, slabs, and foundations.
A structural system should never be selected purely on the basis of a lower material quantity. Safety, serviceability, robustness, durability, fire performance, and applicable structural standards remain essential.
Important: Do not reduce reinforcement, concrete grades, member dimensions, or foundation capacity without the approval of the qualified structural engineer.
3.5 Select Materials Based on Total Value
The cheapest material at the point of purchase is not always the most economical material for the completed building.
Material selection should consider purchase price, transport, installation, wastage, labour availability, maintenance, durability, replacement, and compatibility with the design.
| Material decision | Potential cost benefit | Important consideration |
|---|---|---|
| Locally available masonry | May reduce transport and procurement costs | Verify quality, availability, and installation requirements |
| Standardized tile sizes | Can simplify setting-out and reduce cutting waste | Check module dimensions and room layouts |
| Durable exterior finishes | May reduce repair and repainting frequency | Evaluate climate exposure and maintenance needs |
| Standard door and window modules | Can simplify procurement and detailing | Confirm functional, accessibility, and performance requirements |
| Appropriate prefabricated components | May reduce site labour and installation time | Include transport, lifting, connections, and tolerances |
| Efficient insulation and glazing | May reduce operational energy costs | Assess climate, orientation, initial cost, and actual performance |
Locally available materials can be beneficial, but local availability alone does not establish suitability. Strength, fire performance, moisture resistance, thermal behaviour, workmanship, and relevant standards must also be considered.
Material specifications should be clear enough for comparable quotations. Substitutions should be reviewed for technical performance, compatibility, warranties, and appearance before approval.
3.6 Rationalize Walls, Partitions, and Finishes
Walls and partitions affect material quantities, usable floor area, structural loads, finishing work, and service installation.
The design team should select appropriate wall systems for each location rather than using the same construction everywhere without considering performance requirements.
For instance, a lightweight partition may be suitable for certain internal spaces if it meets the necessary acoustic, fire, impact-resistance, moisture, and fixing requirements. It may not be appropriate in locations requiring substantial load-bearing capacity or specialized performance.
Cost-conscious measures:
- Avoid unnecessary internal partitions.
- Coordinate wall thicknesses with room dimensions and structural planning.
- Use repeatable partition details where suitable.
- Standardize finish specifications for similar spaces.
- Reduce unnecessary changes in floor levels and finish materials.
- Coordinate tile modules, sanitary fixtures, and joinery dimensions.
- Specify wet-area waterproofing and junction details carefully.
A low-cost finish that fails early can create greater expenditure through repairs, disruption, and replacement. Durability and maintenance should therefore be included in the selection process.
3.7 Coordinate Architectural, Structural, and MEP Drawings
Coordination between architecture, structure, and mechanical, electrical, and plumbing (MEP) systems is essential to controlling construction cost.
Poor coordination can result in ducts clashing with beams, pipes passing through unsuitable structural locations, ceiling heights being reduced unexpectedly, or equipment requiring space that was not allowed for in the architectural design.
These conflicts may lead to site modifications, additional labour, material waste, delays, and disputes over responsibility.
Good coordination practices:
- Establish common drawing references, grids, levels, and dimensions.
- Coordinate shafts, service rooms, risers, and ceiling zones.
- Review HVAC ducts, plumbing pipes, cable trays, and firefighting routes.
- Identify slab openings and sleeves before construction.
- Avoid beam penetrations unless specifically designed and approved.
- Check equipment access, maintenance clearances, and replacement routes.
- Resolve drawing conflicts before issuing construction information.
- Maintain a documented record of approved revisions.
For example, a firefighting pipe route that clashes with a beam should be coordinated with the structural engineer and services consultant before the slab is cast. An improvised opening after casting may be more expensive and could compromise structural performance.
Coordinated drawings are not simply a documentation improvement; they are a method of reducing construction risk.
3.8 Simplify Roof Design and Building Details
Roof form affects structural support, waterproofing, drainage, flashing, insulation, and maintenance.
A complicated roof may require additional valleys, junctions, gutters, special flashing, and non-standard construction details. These elements can increase labour and create additional locations where leakage may occur if the detailing or workmanship is inadequate.
Where the architectural concept and site conditions permit, the designer can compare simpler roof arrangements with more complex alternatives.
Consider:
- Standardizing roof slopes and junctions where appropriate.
- Reducing unnecessary changes in roof level.
- Providing clear drainage paths.
- Coordinating rainwater outlets with the structural and architectural layouts.
- Selecting durable waterproofing systems suitable for the exposure conditions.
- Making inspection and maintenance access practical.
Flat roofs are not automatically cheaper than pitched roofs, nor are pitched roofs automatically more economical. The comparison depends on spans, waterproofing, climate, materials, workmanship, drainage, and maintenance requirements.
3.9 Use Standardization and Modular Coordination
Standardization can reduce repeated design effort and simplify procurement and construction.
Where the building programme permits, the design team can repeat room modules, door sizes, window types, bathroom layouts, façade panels, and typical construction details.
A limited range of components may make ordering, installation, replacement, and quality control easier.
Modular coordination also helps align architectural dimensions with available construction products. The design must still account for actual product dimensions, joint widths, tolerances, and installation methods.
Standardization should not create repetitive errors or compromise the building’s function. It is most effective when repeated elements are deliberately coordinated and documented.
3.10 Reduce Construction Waste and Improve Constructability
Construction waste can arise from inaccurate quantities, poor storage, unsuitable ordering, repeated cutting, design changes, damaged products, and inefficient sequencing.
Architects can help reduce these losses by coordinating material dimensions, minimizing unnecessary variations, and providing clear construction information.
Practical measures include:
- Prepare accurate quantity take-offs from coordinated drawings.
- Match product dimensions to the design module where possible.
- Specify suitable storage and protection requirements.
- Coordinate material deliveries with the construction programme.
- Use cutting plans for materials such as tiles, boards, and cladding panels.
- Identify reusable materials and offcuts where technically appropriate.
- Resolve design conflicts before procurement and installation.
- Review waste records to identify recurring problems.
Prefabrication and off-site construction can also reduce certain forms of site waste, but their benefits depend on transportation, lifting requirements, manufacturing tolerances, project scale, and the availability of suitable suppliers.
3.11 Apply Value Engineering
Value engineering is a structured approach to improving the value of a project by examining the functions required and evaluating alternative ways of achieving them.
It is not simply a process of removing features or choosing the cheapest product. A meaningful value-engineering review considers function, performance, cost, reliability, maintainability, and risk.
For example, a proposed façade may use an expensive imported finish. The design team could compare it with a locally available alternative that provides a similar appearance, durability, weather resistance, and maintenance profile.
The alternative should be assessed technically and commercially before a decision is made.
A useful comparison table is:
| Evaluation criterion | Questions to ask |
|---|---|
| Function | Does the alternative perform the required function? |
| Initial cost | What are the supply and installation costs? |
| Quality | Does it meet the project’s performance requirements? |
| Durability | What is its expected service life under actual conditions? |
| Maintenance | What inspections, cleaning, and repairs are required? |
| Programme | Will it affect procurement or construction time? |
| Sustainability | What are the relevant energy, resource, and environmental implications? |
| Risk | Does it introduce additional technical or contractual risk? |
Record the original proposal, the alternative, the estimated cost difference, the performance implications, the approving party, and the final decision.
Any change affecting fire safety, structural performance, accessibility, waterproofing, or other regulated requirements must be reviewed by the responsible professionals.
3.12 Evaluate Life-Cycle Cost and Energy Performance
A building’s financial performance continues long after construction is complete.
Energy, water, maintenance, equipment replacement, and repairs can represent important costs over the building’s life. A decision based only on the initial construction price may overlook these future expenses.
Life-cycle cost analysis (LCCA) compares alternative solutions over a defined study period by considering relevant initial and future costs in a consistent financial framework.
For example, an improved glazing or shading strategy may have a higher initial cost but reduce cooling demand. Whether the investment is economical depends on the climate, building orientation, occupancy, energy tariffs, equipment performance, maintenance, and the assumed study period.
Potential measures include:
- Optimizing orientation and solar control.
- Using suitable daylighting strategies.
- Improving envelope insulation where appropriate.
- Reducing uncontrolled air leakage.
- Selecting efficient lighting and equipment.
- Designing water-efficient plumbing systems.
- Providing maintainable access to building services.
- Evaluating renewable-energy systems where appropriate.
These strategies should be assessed using realistic assumptions rather than universal claims about percentage savings or payback periods.
The objective is to identify alternatives that meet the required performance while minimizing total cost over the chosen period.
4. Cost Reduction at Different Design Stages
Cost control should be integrated into the design process instead of being postponed until construction drawings are complete.
| Design stage | Main cost-control activity | Expected output |
|---|---|---|
| Brief and feasibility | Establish budget, accommodation, scope, and priorities | Agreed brief and initial cost limit |
| Concept design | Compare area, form, planning, and structural options | Preferred concept with preliminary estimate |
| Design development | Coordinate structure, envelope, materials, and services | Updated cost plan and coordinated design |
| Construction documentation | Finalize specifications, details, and quantities | More reliable tender or construction estimate |
| Tender and procurement | Compare compliant bids and confirm scope | Reviewed tender and procurement decisions |
| Construction | Control variations, quality, waste, and programme | Recorded cost changes and approved decisions |
| Handover and operation | Review commissioning, maintenance, and performance | Operational information and lessons learned |
This stage-based approach is consistent with the broader principle in professional design guidance that project strategies and information exchanges should be coordinated across briefing, design, construction, and operation.
The level of estimate detail should increase as the design becomes more developed. Early estimates rely on assumptions and comparable projects; later estimates can use increasingly detailed quantities, specifications, and market information.
5. How to Prepare a Basic Building Cost Plan
A cost plan translates the design into a structured financial estimate.
For an Indian building project, the design team may use relevant local market quotations, applicable government schedule-of-rate references, project-specific productivity assumptions, and measured quantities. CPWD publishes Delhi Schedule of Rates resources and correction slips; these should be checked for the relevant edition, scope, location, and applicability.
A basic building cost plan may include:
- Site preparation and earthwork.
- Foundations and substructure.
- Structural frame and upper floors.
- Masonry and partitions.
- Roofing and waterproofing.
- Doors, windows, and façade work.
- Internal and external finishes.
- Plumbing and sanitary installations.
- Electrical and mechanical services.
- Fire protection and life-safety systems.
- External development and landscaping.
- Testing, commissioning, and other specified works.
- Applicable fees, taxes, overheads, and contingency.
The actual headings depend on the project, procurement arrangement, local requirements, and scope.
Example: Comparing Two Design Alternatives
Assume a hypothetical project has a target construction budget of ₹1 crore. The design team is comparing two compliant alternatives.
| Cost component | Alternative A | Alternative B |
|---|---|---|
| Structure and foundations | ₹32 lakh | ₹30 lakh |
| Envelope and roofing | ₹20 lakh | ₹19 lakh |
| Internal finishes | ₹16 lakh | ₹15 lakh |
| Building services | ₹18 lakh | ₹19 lakh |
| External works and other included costs | ₹14 lakh | ₹14 lakh |
| Total | ₹100 lakh | ₹97 lakh |
In this illustrative example, Alternative B has an initial estimated cost ₹3 lakh lower than Alternative A, a 3% reduction relative to Alternative A.
However, the comparison is useful only if both alternatives include the same scope and meet equivalent functional, structural, safety, and performance requirements. Estimate uncertainty, maintenance, energy use, and any differences in programme should also be reviewed before choosing an option.
The figures are hypothetical and are not market-rate guidance for any particular location or building type.
6. How to Prioritize Cost-Saving Opportunities
Not every proposed saving deserves equal priority. Architects should focus first on changes that remove unnecessary cost while preserving essential performance.
| Priority | Opportunity | Why it matters |
|---|---|---|
| High | Correct excessive floor area | May reduce multiple area-related construction quantities |
| High | Resolve major structural and MEP conflicts | Prevents avoidable rework and disruptive changes |
| High | Simplify unnecessarily complex geometry | May reduce envelope quantities and detailing effort |
| High | Improve cost estimates and change control | Helps expose budget overruns earlier |
| Medium | Standardize repeated components | Can simplify procurement and construction |
| Medium | Optimize finish specifications | May reduce procurement and maintenance costs |
| Project-dependent | Change structural system or spans | Can affect foundations, materials, construction methods, and programme |
| Project-dependent | Add energy-saving systems | May reduce operating costs but increase initial expenditure |
The best opportunity depends on the actual building. A small house, hospital, office building, and industrial facility have different cost drivers and operational requirements.
7. Common Mistakes in Cost Reduction
Choosing the lowest-priced material without checking performance
A cheaper product may have a shorter service life, higher installation costs, or unsuitable technical properties. Compare the complete installed and maintenance cost.
Reducing room sizes without testing functionality
Smaller spaces may reduce quantities but can create unusable layouts, poor furniture arrangements, and circulation problems.
Changing structural members without engineering approval
Unapproved reductions in member dimensions, reinforcement, or material specifications can compromise safety and compliance.
Ignoring MEP coordination
Poorly coordinated openings, shafts, ducts, pipes, and ceilings can create costly site modifications.
Treating all local materials as suitable
Local sourcing may reduce transport costs, but materials must still meet the relevant technical and performance requirements.
Overlooking life-cycle costs
A lower initial price can be offset by higher energy consumption, frequent repairs, or premature replacement.
Making changes after drawings are issued
Late changes can affect quantities, procurement, construction sequencing, consultant work, and contractual responsibilities.
Cutting contingency to make the estimate appear affordable
Contingency should reflect the project’s uncertainty and risk. Removing it without addressing the underlying risks does not eliminate those risks.
8. Benefits and Limitations of Cost-Effective Building Design
Benefits
- Better alignment with the client’s budget.
- More efficient use of floor area and materials.
- Reduced avoidable construction waste.
- Improved coordination between design disciplines.
- More predictable procurement and construction.
- Potential reductions in operating and maintenance expenditure.
- Better transparency when comparing design alternatives.
Limitations and trade-offs
- Some efficient systems have higher initial costs.
- Standardization may restrict certain design choices.
- A compact building form may not suit every climate or site.
- Material substitution can affect durability, appearance, and maintenance.
- Reliable cost comparisons require consistent scope and realistic assumptions.
- Energy and life-cycle benefits depend on actual operating conditions.
Cost reduction should therefore be understood as a process of informed trade-offs, not a universal formula.
9. Practical Cost-Reduction Checklist for Architects
Before finalizing the design, review the following items:
- Client requirements and budget are documented.
- The accommodation schedule is coordinated with the brief.
- Floor area and circulation have been reviewed.
- Alternative building forms have been compared where useful.
- Structural grids and major spans are coordinated with planning.
- Foundations and structural systems have been developed by qualified engineers.
- Material specifications consider quality, availability, and durability.
- Façade, roof, waterproofing, and drainage details are coordinated.
- HVAC, plumbing, electrical, and firefighting routes are coordinated.
- Slab openings and service sleeves have been reviewed before construction.
- Quantities and specifications are sufficiently detailed for the estimate stage.
- Cost-saving alternatives have been assessed for equivalent performance.
- Maintenance and operating costs have been considered.
- Regulatory, fire-safety, accessibility, and structural requirements are protected.
- Design changes and their cost implications are documented.
- An appropriate contingency is retained for unresolved risks.
Frequently Asked Questions
1. What is the best method to reduce building construction costs?
There is no single best method for every project. Start by controlling the building area, simplifying unnecessary design complexity, coordinating the structural and MEP systems, selecting appropriate materials, and preparing reliable cost estimates. The most effective strategy depends on the building type, site, budget, and required performance.
2. How does architectural planning affect construction cost?
Planning influences the building’s total area, circulation, perimeter, room relationships, structural arrangement, and service routes. Efficient planning can reduce unnecessary quantities and simplify construction while preserving functionality, accessibility, and environmental performance.
3. Does a simple building shape always cost less?
No. A compact, regular form may reduce external wall quantities and simplify certain construction details, but site conditions, structural spans, daylight, climate response, façade requirements, and building use also affect cost. Alternatives should be compared using the same functional requirements and project scope.
4. What is value engineering in architecture?
Value engineering is a structured method of improving project value by examining required functions and comparing alternative solutions. It considers cost, performance, quality, durability, maintainability, and risk rather than simply selecting the cheapest option.
5. How can architects reduce material wastage?
Architects can improve material coordination, standardize suitable dimensions, prepare accurate quantities, resolve drawing conflicts before construction, coordinate deliveries, and use cutting plans where appropriate. Good storage, handling, and construction sequencing also help reduce damage and waste.
6. How does MEP coordination save money?
MEP coordination helps identify conflicts among ducts, pipes, cable trays, shafts, ceilings, beams, and slabs before installation. Resolving these issues in the design stage can prevent rework, material waste, delays, and unsafe site modifications.
7. What is the difference between initial cost and life-cycle cost?
Initial cost covers the expenditure required to acquire or construct the building and its systems. Life-cycle cost considers relevant initial and future costs over a defined period, including energy, maintenance, repairs, replacements, and disposal. The lowest initial-cost option is not necessarily the lowest life-cycle-cost option.
8. Can sustainable architecture reduce construction costs?
It can, depending on the design and project conditions. Passive design, efficient equipment, suitable materials, and maintainable systems may reduce operating expenses. Some measures increase the initial budget, so the design team should compare their costs and benefits over an appropriate study period.
9. When should cost planning begin?
Cost planning should begin during feasibility and concept design, when the brief, area, building form, and major systems are still flexible. Estimates should then be updated as the design, specifications, quantities, and market information become more detailed.
10. Which cost references should be used for an Indian building project?
Use current and relevant local market quotations, project-specific quantity take-offs, applicable government schedule-of-rate references, and suitable cost data from comparable projects. CPWD schedule-of-rate documents may be useful where applicable, but they should not be treated as universal market prices for every location or project.
Conclusion
Cost reduction in building design requires more than cutting material prices or removing architectural features. It depends on a coordinated approach to planning, geometry, structure, materials, construction methods, building services, and long-term performance.
Architects can create greater value by identifying cost drivers early, comparing feasible alternatives, preparing reliable estimates, and resolving coordination issues before they become construction problems.
The most successful cost-effective building is one that achieves the client’s essential requirements with an appropriate balance of initial cost, quality, durability, safety, usability, environmental performance, and life-cycle expenditure.
The central principle is straightforward: design out unnecessary cost without designing out essential value.