Absolutely not regarded as best-practice but more as an exception. Sometimes you do need to present 3 sets of values to the user: - one set for positive (true

Absolutely not regarded as best-practice but more as an exception. Sometimes you do need to present 3 sets of values to the user: - one set for positive (true, positive number) - one set for negative (false, negative number) - one set for N/A where N/A != 0 or N/A != true/false But be careful, that road leads to madness :)