The Coca-Cola Company
New Coke Reformulation Disaster
Estimated impact: $30M+ in marketing costs; temporary market share loss (ultimately recovered)
Coca-Cola replaced its 99-year-old formula with "New Coke" based on blind taste tests showing preference for a sweeter formula. Consumer backlash was immediate and fierce. The company reversed course within 79 days, reintroducing the original as "Coca-Cola Classic."
Decision context
Whether to replace the world's most iconic beverage formula based on taste test data, without accounting for brand attachment, nostalgia, and cultural identity tied to the original product.
Decision anatomy
Red = risk factor present · Green = protective factor present
The analysis below was produced from the pre-decision document only. No hindsight. This is what the platform would have surfaced if it had been running at the time.
“Coca-Cola's 1984-85 'Project Kansas' research program conducted 190,000 blind taste tests across 13 cities. Results showed a 55-47 preference for the sweeter 'Merchandise 7X' reformulation vs. original Coke, and a 61-39 preference vs. Pepsi. These results drove the April 23, 1985 decision to replace the original formula entirely. Critics inside Coca-Cola, including bottlers, had raised concerns that blind-taste tests measured initial sip preference rather than brand-experience preference — concerns explicitly overruled by the Project Kansas team.”
Source: Thomas Oliver, 'The Real Coke, The Real Story' (1986); Mark Pendergrast, 'For God, Country and Coca-Cola' (1993); Coca-Cola Company archives
Red flags detectable at decision time
- Test methodology (blind sip preference) did not reproduce actual consumption context
- Research did not test "replace original with new" framing — only "do you prefer A or B"
- Bottler network concerns about brand-loyalty effects documented but overruled
- 99-year-old formula being replaced entirely rather than offered alongside
- No canary market test — single national launch premised on 190,000 blind-test data points
Cognitive biases the platform would have flagged
Hypothetical analysis
DI would flag the New Coke decision as the canonical methodology-framing failure. The research question was 'which formulation tastes better in a blind test' — but the business question was 'should we replace the iconic American brand formula.' A bias-adjusted research protocol would have tested the actual decision: frame-test the reformulation vs. reformulation-alongside-original. The 79-day reversal proves the original product-market fit was always there — the methodology failure was in how Project Kansas framed what it was measuring.
Biases present in the decision
★ Primary driver · Severity estimated from bias type and decision outcome
Toxic combinations
Reference class base rates
Across all 143 curated case studies in our library:
Lessons learned
- Framing the decision as a taste preference ignored the emotional and cultural relationship consumers had with the Coca-Cola brand
- Blind taste tests measured sensory preference in isolation but failed to capture the holistic brand experience
- The speed of reversal (79 days) showed the company could correct course, but the damage to trust was real
Source: Thomas Oliver, "The Real Coke, The Real Story" (1986); Coca-Cola Company archives (Case Study)
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