Abstract Invited for this month's cover is the group of Scott McIndoe at University Victoria (Canada). The picture shows a pressurized reaction vessel with tubing leading out flask. That normally leads directly into an electrospray ionization mass spectrometer, where mass‐to‐charge ratio and relative abundance solution phase ions are measured. These data can be used to generate chronograms each...

An important step when designing an empirical study is to justify the sample size that will be collected. The key aim of a justification for such studies explain how collected data expected provide valuable information given inferential goals researcher. In this overview article six approaches are discussed in quantitative study: 1) collecting from (almost) entire population, 2) choosing based ...