Measuring typing strain

This page aims to collect data on the amount of finger strain incurred by typing different pairs and triples of keys. Once enough data has been collected, the results will be published here into the public domain and may be used to design more ergonomic keyboard layouts or simply to measure and compare the ergonomics of existing keyboard layouts. You can help by taking the survey below.

Over the years, many metrics have been proposed to measure the ergonomics of keyboard layouts, including the number of inward versus outward finger rolls, the percentage of strokes on the home row, the percentage use of weak fingers such as the pinky finger, and more can be imagined.

However, these approximate metrics may turn out to be far from accurate. Are all outward finger rolls equal? Are there some keys on non-home rows that are better than some keys on the home row? Are some uses of the weak pinky finger actually not as bad as others?