lean community at herrero: set based desgin
DESCRIPTION
Implementation and results of Set Based Concurrent Engineering in the design phase and in construction documents detailing.TRANSCRIPT
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Set-based Concurrent EngineeringEric Peabody, NCARB, LEED AP
• Set Based Design• Choosing by Advantages• Set Based Detailing• Relationship to Lean
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VA Palo Alto, Aquatic Center
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Set Based Design1. Divide design into interchangeable
chunks2. Multiple simultaneous designs for
each chunk3. Evaluate Combinations4. Select a combination set
• Choosing by Advantages
5. Swap chunks at roadblocks
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Design Sets: Massing
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Design Sets: Roof Structure
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Design Sets: Skin Design
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Design SetsEvaluate Combinations: n1*n2*n3…nn= many
sets• Massing: 7 options
Roof Structure: 4 optionsSkin Design: 6 options
• 7*4*6=168 design sets
Which is the best option?
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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
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Choosing by Advantages
3. Identify Advantage• Calories:
• Cake has 300 more calories• Cereal has 300 fewer calories• Advantage:
• Cereal’s advantage is 300 few 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
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Choosing by Advantages
9 55 0
0 12 1
0 88 0
0 106 10
0 83 3
7 50 0
16 3724 14
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Swap Chunks• Round 1: client selection
• Massing: Courtyard• Roof Structure: Bow String• Skin Design: Green Screen w/ Translucent Top
• Road block 1: Roof maintenance personnel safety• Trade Flat for Bowstring
• Round 2: 30% scope increase• Keep Massing & Roof Structure• Develop new skin designs• Client selected a variation of the Folded Skin
option.
• Road block 2: Contextuality• Keep Translucent Top & Lobby Design• Trade fenestration and material selection
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Radically Accelerated Schedule
Veterans Affairs Aquatic Center & Gymnasium
• 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)
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Set-Based Detailing
SET 1
SET 2SET 3
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Set-Based Detailing
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Relationship to Lean• Broadly evaluate options (study drawing
phase)• Customer Value• Chain of Value (enough depth to engage C of V)• Limit waste of overprocessing & subsequent rework
• Make decisions slowly, thoroughly considering options• Consider all likely conditions not just the typical• Fix problems before moving forward• Build consensus within Chain of Value• Implement Rapidly• Consider design & construction concurrently
• Increased efficiency (flow & perfection)• Through simultaneous evaluation instead of iterative
loops• Only move forward with the best approach• Redundancy if problem discovered
Questions?Thank you for your time.
Eric Peabody
415 345-3813
The Design Partnership LLP Architects + Planners