ICBB Sample Questions & Answers
All five DMAIC phases carry equal weight, from project selection and Six Sigma basics through process measurement and statistics, variation and hypothesis testing, regression and designed experiments, to lean controls and statistical process control plans.
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- Question 1Intermediate
Measure Phase · Process Mapping
A hospital is experiencing delays in its patient discharge process, leading to bed shortages and patient dissatisfaction. The process involves physicians, nurses, pharmacists, and administrative staff. The project team needs to understand the flow of activities, handoffs, and decision points to identify bottlenecks.
The current process starts when a physician writes a discharge order. This triggers parallel activities: the nurse provides final patient instructions, and the pharmacy prepares take-home medications. Once both are complete, an administrator finalizes billing and paperwork. However, delays are common. Nurses are often busy with other patients, and the pharmacy can be backlogged. Sometimes, the final paperwork reveals insurance issues, sending the process back to the administrative stage and causing significant rework.
The hospital administration wants a solution that reduces the average discharge time by 30% within six months. The solution must not compromise patient safety or the accuracy of billing. The project team has collected preliminary data showing that the 'pharmacy preparation' and 'final paperwork' steps have the highest variability in completion time.
Which tool should the team use FIRST in the Measure phase to visually document the entire process, including all roles, handoffs, and decision points?
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Correct answer: B
A cross-functional flowchart, or swimlane diagram, is the ideal tool for this scenario. It visually depicts the process steps while clearly delineating which department or role is responsible for each action. This will effectively highlight the handoffs between physicians, nurses, pharmacists, and administrators, making it easier to identify delays, redundant steps, and communication breakdowns between the different functional areas.
- Question 2Beginner
Improve Phase · Simple Linear Regression
The R-squared value from a simple linear regression analysis is 0.85. What does this value indicate?
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Correct answer: D
R-squared, also known as the coefficient of determination, measures the proportion of the variance in the dependent variable that is predictable from the independent variable(s). An R-squared of 0.85 means that 85% of the variability observed in the output (Y) can be attributed to the linear relationship with the input (X).
- Question 3Beginner
Control Phase · 5S System
A manufacturing team is implementing a 5S program. They have successfully completed the first three steps: Sort, Set in Order, and Shine. What is the primary objective of the fourth step, Standardize?
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Correct answer: B
The Standardize step is focused on developing the systems and procedures that ensure the gains from Sort, Set in Order, and Shine are maintained. This includes creating checklists, standard operating procedures (SOPs), visual aids (like shadow boards or floor markings), and assigning regular duties to prevent the workspace from reverting to its former disorganized state.
- Question 4Intermediate
Measure Phase · Capability Analysis
During a process capability analysis for a normally distributed process, a Black Belt calculates Cp = 1.67 and Cpk = 0.95. What can be concluded about this process?
graph LR A[Specification] --> B(Process Distribution) subgraph B direction LR C(LSL) -- 1.67 σ --> D(USL) E(Process Mean) -.-> F{Off Center} end style C fill:#f9f,stroke:#333,stroke-width:2px style D fill:#f9f,stroke:#333,stroke-width:2px style E fill:#ccf,stroke:#333,stroke-width:2pxShow answer & explanation
Correct answer: D
Cp (potential capability) measures how the process variation fits within the specification width. A Cp of 1.67 is excellent, indicating the process spread is narrow relative to the specs. Cpk (actual capability) accounts for both variation and centering. A Cpk significantly lower than Cp (0.95 vs 1.67) indicates that the process mean is shifted away from the center of the specification limits, causing one tail of the distribution to be close to a limit, thus reducing actual capability.
- Question 5Intermediate
Measure Phase · Failure Modes & Effects Analysis (FMEA)
A team is conducting a Failure Modes and Effects Analysis (FMEA) on a new medical device assembly process. They have identified a potential failure mode, calculated the Severity, Occurrence, and Detection ratings, and computed the Risk Priority Number (RPN). What should the team do immediately after calculating the RPNs for all identified failure modes?
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Correct answer: C
Calculating the RPN is not the end of the FMEA process. Its purpose is to enable prioritization. The team must use the RPNs to rank the failure modes and identify the highest-risk items. Crucially, any failure mode with a high Severity rating should be given special attention, even if its RPN is not the absolute highest. After prioritization, the team's next step is to brainstorm and assign actions to reduce the risk associated with the top-priority items.
- Question 6IntermediateSelect 3
Control Phase · Poka-Yoke
Which of the following scenarios are appropriate applications of Poka-Yoke (mistake-proofing)? (Select THREE)
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Correct answers: A, B, D
This is a control-type Poka-Yoke that uses a visual guide to prevent the operator from selecting the wrong tool.
This is a classic example of a physical prevention-type Poka-Yoke. The asymmetrical design physically prevents the error of incorrect insertion.
This is a warning-type Poka-Yoke. It doesn't physically prevent the error but alerts the user to a potential mistake before it becomes a defect.
- Question 7Advanced
Improve Phase · Fractional Factorial Experiments
A project team needs to screen eight potentially significant factors to determine which ones impact the yield of a chemical process. The team has a limited budget, allowing for only 16 experimental runs. Which type of experimental design is most appropriate for this situation?
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Correct answer: B
A full factorial design with eight factors at two levels would require 2^8 = 256 runs, which is far beyond the budget. A fractional factorial design is specifically intended for screening a large number of factors with a smaller number of runs. An 8-factor, 16-run design is a common fractional factorial (specifically, a 2^(8-4) design) used to identify the 'vital few' main effects from the 'trivial many' factors, making it the most efficient and appropriate choice.
- Question 8Beginner
Define Phase · Voice of the Customer (VOC)
In the context of the Kano Model, a feature that customers explicitly ask for and which leads to satisfaction when present and dissatisfaction when absent is known as a:
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Correct answer: C
One-dimensional (or Performance) attributes are those that customers are typically vocal about. Satisfaction is proportional to the level of functionality—the more of it, the more satisfied they are, and vice-versa. These are the standard features that companies compete on, like fuel efficiency in a car or battery life in a phone.
- Question 9Beginner
Define Phase · Defining a Process
True or False: The primary purpose of a SIPOC diagram is to provide a detailed, step-by-step map of all activities within a process.
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Correct answer: B
A SIPOC (Suppliers, Inputs, Process, Outputs, Customers) diagram provides a high-level, bird's-eye view of a process. It is used to define the boundaries and scope of a project, not to detail every single step. A detailed, step-by-step map is a Process Flowchart or a Value Stream Map, not a SIPOC.
- Question 10Intermediate
Control Phase · Control Chart Analysis
A food processing plant wants to reduce the variability in the net weight of its packaged cereal. An X-bar and R chart has been used to monitor the filling process. An operator notices a pattern where seven consecutive points on the X-bar chart are all increasing, but are still within the control limits. What is the most appropriate action?
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Correct answer: B
Even though no points are outside the control limits, a run of seven consecutive points all increasing (or decreasing) is a clear signal of a non-random pattern, indicating a special cause of variation is affecting the process. This is one of the standard Western Electric or Nelson rules for detecting out-of-control conditions. The process should be investigated to find the assignable cause (e.g., tool wear, machine drift) before it produces out-of-spec product.
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