Lean Community at Herrero: Set Based Desgin

The Design Partnership LLP Architects + Planners

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

The Design Partnership LLP Architects + Planners

The Design Partnership LLP Architects + Planners

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

eric@dpsf.com

The Design Partnership LLP Architects + Planners