One of his biggest mistakes, he said, was "[not] letting the users tell us if it worked or not.
Otu n'ime mmejọ ya kachasị njọ, ka o kwuru, bụ "[ọ bụghị] ikwe ka ndị ọrụ gwa anyị ma ọ na-arụ ọrụ ma ọ bụ na ọ gaghị arụ.