The first was 1968, but there have been more studies since. https://www.construx.com/blog/the-origins-of-10x-how-valid-is-the-underlying-research/ https://www.

The first was 1968, but there have been more studies since. https://www.construx.com/blog/the-origins-of-10x-how-valid-is-the-underlying-research/ https://www.construx.com/blog/the-origins-of-10x-how-valid-i...