PDCA/PDSA Cycle
The Plan-Do-Check/Study-Act (PDCA/PDSA) cycle is a continuous quality improvement model originally developed by W. Edwards Deming.
| Phase | Activities | Key Questions |
|---|---|---|
| Plan | Identify the problem, analyze the process, develop an improvement plan | What are we trying to accomplish? What change can we make that will result in improvement? How will we know a change is an improvement? |
| Do | Implement the plan on a small scale, collect data | Carry out the plan, document observations, begin analysis of data |
| Check/Study | Analyze results, compare to predictions, summarize findings | Did the change produce the expected results? What did we learn? What went wrong? |
| Act | Adopt, adapt, or abandon the change based on results | If successful, standardize the change. If not, modify the plan and repeat the cycle |
Six Sigma (DMAIC)
Six Sigma is a data-driven methodology aimed at reducing variation and defects to achieve near-perfection (3.4 defects per million opportunities).
| Phase | Purpose | Key Tools |
|---|---|---|
| Define | Define the problem, project scope, and goals | Project charter, SIPOC diagram, voice of the customer |
| Measure | Measure current process performance and collect baseline data | Data collection plan, process mapping, measurement system analysis |
| Analyze | Identify root causes of problems and variation | Fishbone diagram, Pareto chart, hypothesis testing, regression analysis |
| Improve | Develop, test, and implement solutions | Brainstorming, pilot testing, design of experiments, cost-benefit analysis |
| Control | Sustain improvements and monitor performance | Control charts, standard operating procedures, training plans, control plan |
Six Sigma roles include: Champion (executive sponsor), Master Black Belt (expert and mentor), Black Belt (full-time project leader), Green Belt (part-time project member), and Yellow Belt (awareness-level participant).
Lean Methodology
Lean focuses on eliminating waste and maximizing value from the customer's perspective. The eight types of waste (often remembered by the acronym DOWNTIME) are:
- D - Defects (errors requiring rework)
- O - Overproduction (producing more than needed)
- W - Waiting (idle time between steps)
- N - Non-utilized talent (underusing employee skills)
- T - Transportation (unnecessary movement of materials)
- I - Inventory (excess supplies or work in progress)
- M - Motion (unnecessary movement by people)
- E - Extra processing (steps that add no value)
Key Lean tools include: value stream mapping, 5S (Sort, Set in order, Shine, Standardize, Sustain), Kaizen (continuous improvement events), and Kanban (visual workflow management).
Root Cause Analysis (RCA)
Root cause analysis is a structured method for identifying the underlying causes of adverse events or near misses. It focuses on systems and processes rather than individual blame.
- Required by The Joint Commission for sentinel events (unexpected occurrences involving death or serious harm)
- Uses a multidisciplinary team approach
- Asks "why" repeatedly (5 Whys technique) to drill down to the root cause
- Results in an action plan with responsible parties and timelines
Performance Improvement Tools
| Tool | Purpose | How It Works |
|---|---|---|
| Pareto Chart | Identify the most significant factors contributing to a problem | Bar chart arranged in descending order with cumulative line; based on the 80/20 rule (80% of problems come from 20% of causes) |
| Fishbone (Ishikawa) Diagram | Identify potential causes of a problem | Cause-and-effect diagram organized by categories (people, process, equipment, materials, environment, management) |
| Run Chart | Display data over time to identify trends | Line graph plotting data points over time with a center line (median); identifies shifts and trends but not statistical control |
| Control Chart | Distinguish between common cause and special cause variation | Run chart with upper and lower control limits (typically 3 standard deviations from the mean); points outside limits indicate special cause variation |
| Flowchart/Process Map | Visualize the steps in a process | Uses standard symbols (ovals for start/end, rectangles for steps, diamonds for decisions, arrows for flow) |
| Histogram | Show frequency distribution of data | Bar chart displaying how data values are distributed across intervals; reveals patterns such as normal distribution or skewness |
| Scatter Diagram | Show the relationship between two variables | Plots data points on x and y axes to identify correlation (positive, negative, or none) |
| Check Sheet | Systematically collect and organize data | Simple data collection form designed for real-time data entry; often used as input for other analysis tools |
Healthcare Accreditation Bodies
| Organization | Focus | Key Facts |
|---|---|---|
| The Joint Commission (TJC) | Hospitals and healthcare organizations | Deemed status for Medicare certification; conducts unannounced surveys; requires sentinel event reporting and RCA; National Patient Safety Goals |
| CARF | Rehabilitation and behavioral health services | Commission on Accreditation of Rehabilitation Facilities; focuses on person-centered outcomes; three-year accreditation cycle |
| NCQA | Health plans and managed care | National Committee for Quality Assurance; develops HEDIS measures; accredits health plans, managed behavioral health organizations, and credentials verification organizations |
| DNV GL (DNV Healthcare) | Hospitals | Alternative to TJC; uses ISO 9001 quality management standards; deemed status for Medicare; annual surveys |
| CMS | Medicare and Medicaid providers | Conditions of Participation (CoPs); state survey agencies conduct certification surveys; organizations with deemed status may be surveyed by their accreditor instead |
Key Exam Tips
- Know the difference between common cause variation (inherent in the process) and special cause variation (assignable, unusual events)
- Benchmarking compares performance against best practices or industry standards
- A sentinel event is an unexpected event resulting in death, permanent harm, or severe temporary harm - it requires an RCA
- PDCA/PDSA is iterative - the cycle repeats continuously for ongoing improvement