The positive-sum game test: if you have more of X, you also have more of X. To not be confused with positive/negative feedback loops: a positive-sum game can have either positive or negative feedback loops embedded into it (or both).
Note that playing the productivity games needs to be balanced with team's outward contribution: Solve users' problems, not technology problems. (Balance within an organisation)
See People are more important than things.
Make the workplace more fun :)
Part of ‣.