Recently, you promoted your star programmer, Sam, to lead the agile development team. Sam was a fantastic software coder, and you thought the promotion would mean that he could now share his expertise with the other development team members. However, you are surprised to learn that the performance of Sam in his new role is not meeting your expectations.

Which empirical rule did you forget while considering the promotion of Sam?

Question $9$ options:

Expectancy theory

Halo effect

Pareto concept

Murphy's law