Fishbone Diagram Templates
A fishbone diagram sorts the possible causes of a problem into groups, so a team can see the whole field of suspects before deciding which to chase. These fishbone diagram templates give you the head, spine, and labeled category bones already drawn, ready for the problem statement and the causes that branch from each bone. Name the problem, fill the bones, and the analysis takes shape. Open a template and start mapping causes.
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A fishbone diagram, also called a cause-and-effect or Ishikawa diagram, is a way to find the root causes behind a problem instead of treating its symptoms. Developed by Kaoru Ishikawa in the 1960s, it puts the problem at the head of a fish and runs a spine back from it, with major cause categories branching off as bones and specific causes branching off those. Laying the possible causes out by category, rather than as one long list, is what makes the method work. It pushes a team to look across every kind of cause before settling on a culprit, which is why it is a standard part of root cause analysis in manufacturing, healthcare, and service work.
These fishbone diagram templates give you that frame ready to fill, the head for the problem, the spine, and the category bones positioned so each branch has room for the causes you add. The bones come labeled with common categories that you can rename to suit your problem, and you extend each one with the specific and sub-causes your team raises. The structure stays put as the diagram fills, so a crowded analysis stays readable from head to bone.
Worth knowing: Write the problem statement first and keep it specific, since every bone points back to it. A vague head such as quality issues pulls the whole analysis off course, while a precise one such as rising defect rate on line 3 keeps each branch relevant.
Fishbone elements
What the diagram is made of, from the problem at the head to the sub-causes on each bone.
The effect under analysis, written at the head of the fish on the right. A specific problem keeps every branch focused on one issue.
The central line running back from the head, the backbone the category bones attach to. It ties the whole analysis to the one problem at its end.
The main branches off the spine, each grouping one kind of cause. In manufacturing these are often the 6 Ms: Method, Machine, Material, Manpower (people), Measurement, and Mother Nature (environment). The labels can be renamed to suit any field.
The smaller branches off each bone, naming the specific causes within a category and, where useful, the causes behind those. Asking why of a cause is what turns it into its sub-causes.
An optional branch at the far end of the spine, often left empty but sometimes used to note the conclusion or chosen solution once the analysis points to it.
The 6 Ms are a manufacturing starting point, not a fixed rule. Service and marketing teams often swap in their own categories, and Ishikawa himself encouraged naming the bones in whatever terms communicate best to the people using the diagram.
Building a fishbone diagram
From a well stated problem to a diagram that groups every likely cause by category.
Open the fishbone template closest to your situation and write the effect you are analyzing in the head of the fish, kept specific. This is the one thing every bone points back to, so a precise statement keeps the whole analysis on target.
Rename the bones to the cause categories that fit your problem. The 6 Ms (Method, Machine, Material, Manpower, Measurement, Mother Nature) work well for production issues, while a service or office problem might use People, Process, and Policy instead.
Tip — Four to six bones is a workable range. Too few and the causes pile onto one branch; too many and the diagram thins out.
With the team, add the specific causes under each category as branches off that bone. Place a cause wherever it best fits, and do not worry if one cause could sit under two bones, that overlap is normal.
For each cause, ask why it happens and branch the answers off as sub-causes. Repeating the question a few times moves the diagram from surface symptoms toward the root causes worth fixing.
Step back and look across the bones for the causes that recur or matter most. Mark the few worth investigating first, since the diagram is meant to point to action, not just to catalog ideas.
Set the colors, fonts, and bone styling in the template to fit your subject. Coloring each category differently makes a busy diagram easier to read at a glance. Then download or print it to share with the team.
FAQs
What is a fishbone diagram also called?
It goes by three names for the same thing. Fishbone diagram describes its shape, the head and the bones branching off a spine. Cause-and-effect diagram describes what it does, linking causes to one effect. Ishikawa diagram credits Kaoru Ishikawa, who developed it in the 1960s. You will see all three used interchangeably, often within the same field.
How does a fishbone diagram compare to other problem-solving methods?
A fishbone diagram is about sorting the possible causes of a problem into categories, not about sequence or frequency. A flowchart maps the order of steps in a process, and a Pareto chart ranks problems by how often they occur. The fishbone comes earlier in the work, when a team is still generating and grouping candidate causes, and it pairs naturally with those other methods once the field has been narrowed.
How should I categorize the causes?
Pick categories broad enough to hold several causes but specific enough to be useful. The 6 Ms, Method, Machine, Material, Manpower, Measurement, and Mother Nature, are a tested starting point for manufacturing, and adapting them to your context usually beats forcing a problem into labels that do not fit. A service team might use People, Process, and Place. The aim is categories that prompt your team to think across the whole problem.
How do I decide which causes to act on?
A finished diagram usually lists more causes than any team can chase at once, so the next step is to narrow it. Look for causes that appear under more than one bone, then weigh them with whatever evidence you have, data where it exists or a team vote where it does not. Concentrating on the few causes most likely to drive the problem keeps effort where it counts.
Can I rename the bones in these templates?
Yes. The category labels, the problem head, and every branch are editable, so you can swap the 6 Ms for categories that suit your field, add or remove bones, and extend each one with your own causes. The templates give you the head, spine, and bones already drawn, so you change the labels and fill the branches rather than building the frame yourself.