The choice between traditional delivery and design and construct is ultimately a decision about who should own the remaining design decisions.
The Week 8 material contrasts traditional construct-only procurement with design and construct. In the traditional model, design and construction are procured separately and the client retains more design responsibility. In design and construct, detailed design and construction sit under one contract, with additional design risk transferred to the contractor.
That distinction is more important than the labels.
The strategic question is where design authority, design integration and design consequences should sit.
The Strategic Context
Projects rarely move from concept to construction with every design question resolved.
Some design decisions remain open because suppliers possess specialist knowledge, because technology changes or because detailed integration is best completed by the party actually constructing the solution.
Traditional procurement gives the client greater control over design before construction.
Design and construct gives the contractor greater responsibility for converting performance requirements into an integrated delivered solution.
Each approach creates different risks.
What Leaders Commonly Misread
The first mistake is assuming design and construct automatically transfers all design risk.
The second is assuming traditional procurement provides maximum certainty simply because design is more developed.
The third is issuing highly prescriptive designs under a design-and-construct contract and then expecting the contractor to carry full performance responsibility.
The fourth is retaining approval rights that effectively control design while still trying to transfer the consequences.
The fifth is selecting the model based only on schedule.
Reframing the Issue
The decision should focus on design authority aligned with design accountability.
If the client wants to control detailed design, it should recognise that retained control may carry retained risk.
If the contractor is expected to warrant or deliver performance, it needs enough freedom to make the design decisions necessary to achieve that result.
The strongest model aligns:
- technical freedom;
- approval authority;
- professional responsibility;
- acceptance;
- change control.
Strategic Analysis
Consider a hypothetical processing plant.
The client has a mature standard plant design used across multiple sites.
Most equipment interfaces are known and internal engineering capability is strong.
A traditional approach may preserve standardisation and allow construction to be competed against a detailed design.
Now consider a new automated facility using technology the client has not previously integrated.
A design-and-construct model may allow specialist suppliers to combine design and implementation more effectively.
However, the client still needs a clear functional brief, performance requirements and interface constraints.
Transferring design responsibility does not remove the buyer's obligation to define the outcome.
Executive Trade-offs
Traditional procurement can preserve design control and improve comparability when design is mature.
It can also create separation between designer and constructor, potentially increasing interface disputes.
Design and construct can improve integration and create single-point responsibility.
It can also reduce the buyer's detailed design control and make tender comparison harder if performance requirements are vague.
The strongest choice depends on requirement maturity, internal engineering capability, market expertise and the strategic value of standardisation.
Decision Framework
Use five tests.
Design maturity
How much detailed design already exists?
Internal capability
Can the buyer govern design quality effectively?
Supplier expertise
Does the market possess stronger solution knowledge?
Integration
Would separating design and construction create material interface risk?
Control
How much detailed design authority does the buyer genuinely need to retain?
The answer should determine the model rather than habit.
From Strategy to Execution
Immediate action: document which design decisions remain open at procurement.
Medium-term capability building: align performance specifications and acceptance tests with the design responsibility being transferred.
Long-term strategic positioning: retain enough technical capability to act as an intelligent client even when detailed design is outsourced.
The buyer should never outsource its ability to understand whether the design is fit for purpose.
Governance Implication
The delivery model should also define how design changes are authorised after award. If the client retains extensive approval rights, those rights can become a schedule dependency and may alter the practical allocation of design responsibility. Governance should therefore distinguish design assurance from design control so that accountability remains clear.
It should also identify who is responsible for design verification, constructability feedback and final acceptance.
Signals to Monitor
Watch for design-and-construct contracts with highly prescriptive drawings, traditional contracts with major unresolved design interfaces, excessive approval cycles that blur accountability and repeated variations caused by the boundary between designer and constructor.
Questions for the Leadership Team
- Which design decisions remain unresolved?
- Who is best positioned to make them?
- Does design authority match design accountability?
- What technical capability must the client retain?
- Are performance requirements strong enough to support design freedom?
- Which interfaces become simpler or harder under each model?
Closing Perspective
The procurement model should place design responsibility where design decisions can be made most effectively.
Transfer without authority is weak risk allocation.
Control without accountability is equally weak.
The objective is to align design freedom, technical capability and commercial responsibility.
Related article: When Is the Design Ready for Procurement? Balancing Definition, Innovation and Schedule
Related article: You Cannot Fix the Price of an Undefined Outcome
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