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Set-based Concurrent DesignEric Peabody
The Design Partnership ■
Architects + Planners
415 345-3813
Set-based Concurrent Design What is Set-Based? Set-Based Detailing Set-Based Design Choosing by Advantages Results
Why Do We Care?
What is Set-Based Design?
• Iteration in design is part value added and part waste– Understanding the problem and range of
solutions is value added– Rework and time delay is waste
• “Posing alternative design solutions as sets, rather than as point solutions is the strategy at the heart of…set-based design.”
• (Ballard, Lean Construction Institute, “Positive vs Negative Iteration in Design”)
Iterative Loops
Set-based Design
Iterative Design Set-Based Design• Sequential processing adds
time• Release incomplete work for
others to start evaluating• Simultaneous evaluation of
options
• Select best alternative as quickly as possible to move to next stage
• Carrying multiple options allows more time for analysis
• Defer commitment to avoid premature decisions with incomplete knowledge
• One design contribution can invalidate all previous work
• Identifying a problem with an option reduces the design space but does not trigger rework
Set-Based Detailing
SET 1
SET 2SET 3
Set-Based Design1. Divide design into interchangeable
chunks
2. Multiple simultaneous designs for each chunk
3. Evaluate Combinations
4. Select a combination set• Choosing by Advantages
5. Swap chunks at roadblocks
VA Palo Alto, Aquatic Center
Design Sets: Massing
Design Sets: Roof Structure
Design Sets: Skin Design
Design SetsCombinations: n1*n2*n3…nn= many sets
Massing: 7 optionsRoof Structure: 4 optionsSkin Design: 6 options
7*4*6=168 design sets
Which is the best option?
Choosing by Advantages• The Fundamental Rule of Sound Decision-making:
• Decisions must be based on the importance of advantages.• Pros & Cons = double counting
1. Identify Attributes:• Cake vs Cereal for Breakfast
• Calories• Taste
2. Identify Difference in Attribute Value:• Cake for breakfast = 500 calories• Cereal for breakfast = 200 calories
• Difference = 300 calories
Choosing by Advantages3. Identify Advantage
• Calories:• Cake has 300 more calories• Cereal has 300 fewer calories• Advantage:
• Cereal’s advantage is 300 fewer calories • Cake has no calorie advantage
• Taste: • Cake tastes very good.• Cereal tastes okay.• Advantage:
• Cake’s advantage is it tastes much better • Cereal has no taste advantage
Choosing by Advantages4. Evaluate the Importance of the Advantage
5. Select the option with the highest Advantage• Cereal for breakfast
Cake CerealCalories
No Advantage 0 300 Fewer Calories 10
Taste Tastes Much Better 5 No Advantage 0
5 10
Selecting an Option
9 55 0
0 12 1
0 88 0
0 106 10
0 83 3
7 50 0
16 3724 14
The Design Partnership LLP
Architects + Planners
Swap Chunks• Initial Client Selection
• Massing: Courtyard• Roof Structure: Bow String• Skin Design: Green Screen w/ Translucent Top
• Road block 1: Roof maintenance safety• Keep Massing & Skin Design• Trade Roof Structure: Flat for Bowstring
• Road block 2: 30% scope increase• Keep Skin Design & Roof Structure• Trade Massing: New Massing Option
• Road block 3: Contextuality• Keep Massing & Roof Structure• Trade Skin Design: Rainscreen for Green Screen
The Design Partnership LLP
Architects + Planners
Radically Accelerated Schedule
• Typical Project Schedule: • 30 to 45 minutes per SF for design.
• Radically Accelerated Schedule:• 30,000 SF in 4 months – Programming through CD
3 minutes per SF for design (10 to 15 times faster)
Set-based Concurrent DesignEric Peabody
The Design Partnership ■
Architects + Planners
415 345-3813