ICBB case studies

ICBB · Put your knowledge to work in context.

The IASSC Certified Lean Six Sigma Black Belt (ICBB) is a third-party professional designation for practitioners who are well versed in the Lean Six Sigma methodology and who lead complex improvement projects, typically in a full-time capacity. The credential signals advanced proficiency across the DMAIC phases - Define, Measure, Analyze, Improve and Control - as defined by the IASSC Lean Six Sigma Black Belt Body of Knowledge. The ICBB case studies are 5 cases and about 5,049 words.

On-Time Delivery Charter at a 14-Branch Distributor

Northline Industrial Supply distributes fasteners and fittings through 14 branches. The VP of Sales has chartered a Black Belt project with this draft objective: 'Eliminate all customer dissatisfaction and fix delivery performance across the company, including the new e-commerce site.' Context: 6,200 order lines ship per month, and a customer scorecard penalty of $46,000 was charged last quarter.

966 words, about 5 min 2

Gauge R&R and Capability at Cedar Valley Machining

Cedar Valley Machining produces a 25.00 +/- 0.05 mm bore on a hydraulic manifold. A new air gauge was installed and the quality engineer ran a GR&R study: 10 parts, 3 operators, 3 trials, randomized.

962 words, about 5 min 3

Shift B and the 30,000 Inspection Records

At a medical-device assembly plant the final visual-inspection defect rate is 4.8% against a 2.0% target. The Black Belt pulled 30,000 inspection records from the last quarter and compared shift A (4.2%) with shift B (5.4%); a chi-square test gave p < 0.001.

987 words, about 5 min 4

Hard-to-Change Flux Factor on the Wave Solder Line

At a printed-circuit-board plant the wave-solder first-pass yield is 91.2% against a 96% target; the dominant defect is bridging, at 62% of defects. A team ran a designed experiment on three factors: preheat temperature (100 vs 120 C, easy to change), conveyor speed (0.8 vs 1.0 m/min, easy), and flux type (A vs B).

1,034 words, about 5 min 5

Nine Points Below Center on the 500 mL Fill Line

At a bottling plant a 500 mL fill line has specification limits of 497-503 mL. An Xbar-R chart with n = 5, subgroup every 30 minutes, has run for two years at a mean of 500.0 mL with a within-subgroup sigma of 0.75 mL, giving Cpk = 1.33 and roughly 7 ppm out of specification.

1,100 words, about 6 min