In the philosophy of science, there is a principle sometimes called convergence of independent lines of evidence: when multiple different methods, applied independently, point toward the same conclusion, confidence in that conclusion increases.

For the interpretation of Shanidar Z’s burial as intentional, the convergence argument works as follows.

The body position, carefully documented during excavation, is consistent with deliberate placement.

The specific location within the cave — in an area that had previously received other Neanderthal burials — suggests the location was chosen.

The pattern of remains at Shanidar overall, with multiple individuals in a relatively restricted area over an extended time period, is consistent with the location being used repeatedly as a burial site.

The presence of similar burial contexts at other Neanderthal sites across Europe and the Near East — La Chapelle-aux-Saints, Kebara, La Ferrassie, Amud — reduces the probability that any single instance is coincidental.