This is a causal map of the accident, built with the HFACS framework. Circles are findings; lines are the causal links between them — from organizational factors at the top down to the accident at the bottom.

Layout

• Five bands, top → bottom: Level 4 Organizational · Level 3 Unsafe Supervision · Level 2 Preconditions · Level 1 Unsafe Acts · Accident.
• Each circle sits in the band of its HFACS level (color-coded).
• Circle size = how many links connect to it — bigger means more central.
• Line brightness/thickness = confidence; red lines lead into the Accident.

Explore, step by step

1. Read top to bottom — organizational roots flow down through supervision and preconditions to the unsafe acts and the accident.
2. Hover a circle to read the finding; hover a line to see the relationship in plain words (e.g. "created condition for", "enabled").
3. Click a circle to trace its causal chain: upstream causes light up cyan (flowing up), the path to the accident lights up violet (flowing down), and everything else dims — and a detail panel opens on the right with the finding's full record.
4. Click a line to open that link's full details in the same right-hand panel.
5. Click the Accident node to highlight every chain that ends in the accident, with a summary in the panel.
6. Click empty space, or press Esc, to clear the highlight; close the panel with its × (or Esc).

The detail panel (right side)

Whenever you click a circle or a line, a panel slides in from the right with the full record — so you never have to read detail off the map itself:

• For a finding (circle): its HFACS level and name, the short description, the full causal explanation, how connected it is (links in / out / total), and its status.
• For a link (line): the two findings it connects (with their levels), the relationship, the confidence, and the basis — the evidence/justification behind the link.
• For the Accident: a summary of how many unsafe-act findings converge into the outcome.

The panel is read-only — it's for reading the investigation's detail. Close it with the × in its corner, or press Esc.

Move around

• Drag to pan · scroll or pinch to zoom · the Fit button (⤢) resets the view.

What to look for

• The largest circles are the most connected findings — usually the systemic issues that deserve the most attention.
• Follow a chain from the top band down to the accident to see how high-level decisions enabled the front-line failures.
• Addressing the few findings that sit on many chains breaks the most paths to the accident.

Open the Legend (bottom-right) any time to decode colors and sizes.