Most companies respond to the symptoms with surface fixes like pay raises or new employee benefits. The real solution is to trace the problem back to where it starts, using Root Cause Analysis (RCA). RCA is a structured diagnostic tool. It shows you not “who” is leaving but “why” they leave, and what needs to change so those reasons don’t come back.
In this post, you will see how to use Root Cause Analysis in your HR strategy, how to raise your employee retention rate with a scientific method, and why data-driven HR decisions are so powerful.
Root cause analysis (RCA): why it matters for HR
RCA is a systematic process for identifying the cause of an event. For HR, it feeds directly into any strategy for reducing turnover:
- Cost optimization: Instead of handing out general benefits to every employee to bring turnover down, you invest only in solutions that target the root causes and get the most ROI out of your budget.
- Strategic focus: Is it manager quality, unfair pay or a lack of development? RCA picks the most critical cause out of several possible ones, so you can focus your HR strategy on a narrow area.
- Systemic improvement: RCA looks past individual incidents to the systemic problems underneath (for example, a weak performance management process), which is how it produces lasting solutions.
Core RCA frameworks for HR problems
These are the two most widely used RCA methods, and the two that suit HR best:
1. The 5 Whys technique
This simple but powerful technique starts from a problem and asks “Why?” at least five times in a row, working down from the surface symptom to the most basic source.
| Step | Question | Answer |
|---|---|---|
| Problem | Why did Employee A resign? | They felt their pay was unfair. |
| 1. Why? | Why did they feel their pay was unfair? | They found out it was below the market average. |
| 2. Why? | Why didn’t we know it was below the market average? | Our pay benchmarking data was out of date. |
| 3. Why? | Why was our data out of date? | The compensation analysis process had been neglected. |
| 4. Why? | Why was that process neglected? | The HR team had no compensation specialist. |
| 5. Why? (Root cause) | Why was there no specialist? | The budget had no room for the role. |
Root cause: Not the perception of unfair pay, but the company’s underinvestment in compensation expertise.
2. The fishbone diagram (Ishikawa diagram)
The fishbone diagram (also called a cause-and-effect diagram) is used to group and visualize all the possible causes (the bones) of a complex problem (the effect). Let’s look closely at how HR can use it, with the main problem of this post, “High Employee Turnover”, at the center.
Anatomy of the diagram. An Ishikawa diagram has three main components:
- Head (effect/problem): The outcome you want to analyze (here: high employee turnover).
- Spine: The central horizontal line that connects all the main components.
- Bones (main categories): The main systemic areas that could be causing the problem. Traditional manufacturing uses the 4Ms (Man, Machine, Method, Material). In HR, these categories are redefined around the employee experience.
HR-focused bone categories (the 4P and 2S model) When analyzing the root causes of employee turnover, these six categories (bones) give HR professionals the most complete view:
| Bone category | Focus of the analysis | Example possible causes (small bones) |
|---|---|---|
| 1. People | The skills, shortcomings and relationship problems of individuals (employees and managers). | • Inadequate Manager Coaching (Lack of Leadership Skills) • Unconstructive Conflict Within Teams • Lack of Motivation and Engagement |
| 2. Processes | Inconsistent, missing or inadequate HR processes and workflows. | • Weak Performance Management & Career Mapping • Non-Objective Pay and Promotion Processes • Poor Onboarding Experience |
| 3. Place | The physical work environment, corporate culture and psychological safety. | • Overwork Culture (No Work-Life Balance) • Low Perceived Psychological Safety • Ineffective Hybrid/Remote Work Practices |
| 4. Policies (financial) | How competitive pay, employee benefits and company policies are. | • Pay Below the Market Average • Unattractive Benefits Package • Rigid Working Hours/Leave Policies |
| 5. Systems/Tools | Gaps in the technology and infrastructure that support the work. | • Outdated/Slow Technology (IT Infrastructure) • Development and Training Programs That Are Hard to Use • Ineffective Internal Communication Channels (Communication System) |
| 6. Strategy | The company’s overall direction and problems in aligning HR with it. | • Company Goals Not Communicated to Employees (Lack of Meaning) • Uneven Distribution of Workload (No Talent Strategy) |
How to apply the fishbone diagram (tips)
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Clarify the problem Before you start, pin down the problem in the “head” (for example: turnover across the whole company, or only first-year turnover?).
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Brainstorm The HR team gathers input from managers and from people who have left, and lists every possible cause (small bones) under each main category (bone).
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Go deeper with the 5 Whys Once a small bone is identified, apply the 5 Whys to find out whether it really is a root cause.
Example: Small bone: Inadequate Manager Coaching. Why? Managers received no coaching training. Why? The development budget went to technical training. → ROOT CAUSE.
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Validate with data After the analysis, check the potential root causes that emerge (for example, manager skills) against real HR data (survey scores, performance data and so on).
The benefit: This visual, structured approach shows that turnover can’t be explained by a single cause (pay, for instance). It is the result of a systemic failure, and seeing it that way lets you build a holistic action plan.
A step-by-step RCA guide for HR strategy
- Define and narrow the problem Instead of overall turnover, focus the analysis on the area hit hardest. (Example: turnover among engineers hired in the last 6 months rose by 30%.)
- Collect data RCA is only as strong as its data. Besides exit interviews, collect survey scores, performance reviews, managers’ 1:1 notes and demographic data (tenure, age, department).
- Run the analysis Use the 5 Whys or the fishbone diagram, depending on the data you have and how complex the problem is. Question the causes thoroughly and list the potential root causes.
- Validate the root causes To make sure the root causes you identified really drive the problem, turn to statistical data or comparative analysis. (Example: validating with evidence such as “Turnover in Manager X’s team is 3 times the company average.”)
- Build the action plan Develop lasting, preventive solutions aimed at the root cause. (Example: if the root cause is inadequate manager training, the solution should be to invest in manager development and add leadership competencies to the promotion criteria.)
Root cause analysis: from passive HR to strategic HR
Root Cause Analysis moves HR from a reactive approach to crises to a proactive one that prevents problems before they surface.
Instead of treating turnover as just a number, use it as a diagnostic tool. Applying RCA regularly puts your HR strategy on a scientific footing. Rather than being seen as a cost center, HR earns its place as a strategic investor that drives business growth.
Stop guessing at your company’s biggest challenge. Analyze it and solve it at the root.