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Three dependent values got me thinking about electricity and the rules of thumb for calculating power, current and voltage or current, voltage and resistance. In this Ohm's law calculator (at the end of the page) user has to enter two and only two values and click "Calculate" to get the third one. It's easy to click reset and to enter new values but if the ...


Design for the primary use case, then take care of secondaries I would guess that most users will know what they want to calculate, so they will come in, fill out two fields, then calculate the third. So this is the primary use case. Sometimes, users will change their minds or want to explore other variations, so they will switch fields or recalculate. ...

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