How to Measure Anything is great! It has some brilliant advice - for example: you can get a 95% confidence interval for the median of an unknown thing with just

How to Measure Anything is great! It has some brilliant advice - for example: you can get a 95% confidence interval for the median of an unknown thing with just 5 measurements! And he describes a framework for how to calculate the value of measurement (e.g. how much is running an experiment that costs $1,000 worth -- will the information we gain be more valuable than the cost? etc).