The recent publication of internationally agreed standards (ANSI/ASA, 2009b; ISO, 2012) is the first step towards rectifying
this issue and it is encouraging to see many researchers adopting these methods as closely as possible (Bahtiarian and Fischer, 2006; De Robertis et al. 2012; Peña et al., 2011).
The fact that these researchers appear to have found it challenging to meet some of the requirements for the highest measurement precision methodology set out in the standards highlights the difficulty of undertaking these measurements in practice.