The design process, contracts

What is the Double Diamond Model?

A design thinking framework that divides the process into four phases: Discover, Define, Develop, and Deliver. It maps the journey from the initial problem to problem definition, and finally to the solution.

How is the design process generally represented in terms of workflow?

Rather than a straight line, it is an iterative, oscillating cycle. A common representation includes the following steps: Understand, Observe, Synthesis, Ideate, Prototype, and Test.

How do the potential for cost reduction and the cost to change a design shift over a project's timeline?

The potential for cost reduction starts very high and exponentially decreases as the project moves forward. Conversely, the cost to change the design starts low and exponentially increases as the project moves toward construction and operation.

What is "Sunk Cost Bias" in the context of engineering and design?

It is the resistance to change that sharply increases alongside the cost of making changes. This bias often leads engineers to repeat familiar but sub-optimal designs because the risk profile is known, which ultimately impedes innovation.

What is the primary purpose of the Briefing phase?

To elicit the client's functional requirements (what the structure must do), establish project performance criteria, and carefully differentiate between what the client "wants" and what they actually "need."

What is the primary goal of Stage 0 (Strategic Definition)?

To determine the best means of achieving the Client's Requirements.

What are the key outcomes of Stage 1 (Preparation and Briefing)?

Approving the Project Brief and confirming that the project can be safely and effectively accommodated on the site.

What key activities happen during Stage 2 (Concept Design)?

Stage 2 is when the Architectural Concept is approved by the client and aligned to the Project Brief. It involves finalizing functional requirements, developing the concept design, establishing preliminary costings, securing planning consent, and confirming the procurement route.

What is the focus of Stage 3 (Spatial Coordination)?

Stage 3 is the phase where architectural and engineering information is spatially coordinated. It focuses on the resolution of technical systems, developing the design solution, and establishing design coordination parameters.

What is achieved in Stage 4 (Technical Design)?

Stage 4 encompasses all design information required to manufacture and construct the project. The design is extended to the level of detail required for manufacture, fabrication, and onsite construction

Does active design work happen in Stage 5 (Manufacturing and Construction)?

No. This stage focuses entirely on physical construction and commissioning. The only design-related work involves responding to site queries.

What marks the completion of Stage 6 (Handover)?

The building is officially handed over to the client, aftercare is initiated, and the building contract is concluded.

What defines Stage 7 (Use)?

This is the ongoing lifespan phase where the building is actively used, operated, and maintained efficiently.

What are the defining characteristics of the Design and Build (D&B) procurement route?

The client interacts with a single point of responsibility (the D&B Contractor) who handles both the design and the construction, usually operating under a standard lump sum contract.

What are the main advantages and disadvantages of Design and Build?

• Advantages: A firm price is agreed upon prior to construction, the overall project duration is shorter, and liability is centralized to one entity.

• Disadvantages: Bids are difficult to compare, the contractor must be appointed before the design is complete, and any late changes requested by the client are very expensive.

How does Management Contracting work?

A Management Contractor acts as a consultant to the client regarding programming and buildability. The actual construction work is divided into packages and awarded to separate "works contractors" on a lump sum basis.

What are the pros and cons of Management Contracting?

• Advantages: It allows design and construction to overlap concurrently (reducing project duration) and easily accommodates late design changes.

• Disadvantages: There is poor price certainty because the total cost remains unknown until the final package is let, and it requires a highly skilled, cooperative project team to succeed.

What is the core philosophy behind the NEC4 Engineering and Construction Contract (ECC)?

It is a modern, collaborative, and non-adversarial contract written specifically to embody a "spirit of mutual cooperation" between parties.

Who owns the programme in an NEC4 contract, and why is it critical?

The contractor provides and owns the programme. It is a legally binding part of the contract that defines all activities, interdependencies, and key dates, which ultimately determines if and when the contractor gets paid.

What is a "Compensation Event" in the NEC4 ECC?

It is an event identified in a shared risk register that dictates when a party (client or contractor) must be granted more time or money. This can include predicted future events, allowing money to be spent proactively to minimize risk exposure.

What are the six payment options available in the NEC4 ECC?

• A: Priced contract with activity schedule

• B: Priced contract with bill of quantities

• C: Target contract with activity schedule

• D: Target contract with bill of quantities

• E: Cost reimbursable contract

• F: Management contract

How do risk allowances affect a priced contract?

The estimated cost is not the final price; the final price equals the cost plus profit and a risk allowance. If the risks do not materialize, the unspent risk allowance becomes retained profit for the contractor. However, adding too much risk allowance upfront will result in an uncompetitive tender.

What is the definition of "assimilation" in the design process?

Assimilation is the accumulation and ordering of general information related to the problem at hand.

How is "generative study" defined?

Generative study is the investigation of the project's nature and its possible solutions.

What is the role of a "Connector"?

A Connector is someone with good relationships with many of the stakeholders required for the project.

How is a "Cross-system thinker" defined?

A Cross-system thinker is someone who has the ability to think in systems, cross silos, join things up, and bounce between micro and macro perspectives.

What is "Briefing"?

Briefing is the process of eliciting the client's functional requirements to which the design will respond. It requires clarifying the purpose, focusing on strategic needs, differentiating between wants and needs, and challenging the stated brief.

How is "Design Fixity" defined?

Design fixity refers to the dynamic where, as a project progresses through its lifecycle (Concept, Development, Design, Construction, Operation & maintenance), the cost reduction potential decreases while the cost to change increases.

What is the "Sunk Cost Bias" in design?

It is a bias where engineers repeat previous, sub-optimal designs because they understand how it does not work and have developed ways to overcome those shortcomings. This results in a poor fit to requirements, but is chosen because the risk profile is familiar and understood