AIA NTAP Conference Set Based Design

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The construction industry is one of the only industries with declining productivity. Tools like BIM, IPD, and Lean aim to reverse this trend. Set-based Concurrent Design is a Lean alternative to the traditional iterative design loops and enables projects to be designed 10 to 15 times faster.

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AIA NTAP Conference Set Based Design

  1. 1. Set-based Concurrent Design Eric Peabody The Design Partnership ■ Architects + Planners 415 345-3813 eric@dpsf.com
  2. 2. Set-based Concurrent Design  What is Set-Based?  Set-Based Detailing  Set-Based Design  Choosing by Advantages  Results
  3. 3. Why Do We Care?
  4. 4. 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”)
  5. 5. Iterative Loops Set-based Design
  6. 6. 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
  7. 7. Set-Based Detailing SET 1 SET 2SET 3
  8. 8. Set-Based Design 1. 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
  9. 9. VA Palo Alto, Aquatic Center
  10. 10. Design Sets: Massing
  11. 11. Design Sets: Roof Structure
  12. 12. Design Sets: Skin Design
  13. 13. Design Sets Combinations: n1*n2*n3…nn= many sets Massing: 7 options Roof Structure: 4 options Skin Design: 6 options 7*4*6=168 design sets Which is the best option?
  14. 14. 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
  15. 15. Choosing by Advantages 3. 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
  16. 16. Choosing by Advantages 4. Evaluate the Importance of the Advantage 5. Select the option with the highest Advantage • Cereal for breakfast Cake Cereal Calories No Advantage 0 300 Fewer Calories 10 Taste Tastes Much Better 5 No Advantage 0 5 10
  17. 17. Selecting an Option 9 55 0 0 12 1 0 88 0 0 106 10 0 83 3 7 50 0 16 3724 14
  18. 18. 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
  19. 19. 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)
  20. 20. Set-based Concurrent Design Eric Peabody The Design Partnership ■ Architects + Planners 415 345-3813 eric@dpsf.com

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