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


VA Palo Alto, Aquatic Center


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


Design Sets: Massing


Design Sets: Roof Structure


Design Sets: Skin Design


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?


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



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



9 55 0

0 12 1

0 88 0

0 106 10

0 83 3

7 50 0

16 3724 14


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


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)


Set-Based Detailing

SET 1

SET 2SET 3


Set-Based Detailing


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

[email protected]


Lean Community at Herrero: Set Based Desgin

Design

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