Many auditors rely on one of the standard audit procedure support systems that provides standardized forms for performing substantive tests and includes charts for determining sample size. It is tempting to rely totally on the packaged sample information or form (i.e., pull form, find sample size in chart, pull sample), rather than to go through a rigorous process to decide which sampling method applies and what the sample size and potential deviations mean to the audit. Also, according to some experts, the trend today is to use less-rigorous, nonstatistical sampling to reduce cost, and there is a risk that such an approach may be substantially less capable of detecting a material error than a statistical approach, such as probability-proportional-to-size (PPS) sampling. The downside of this rigorous statistical approach is the complexity of statistical sampling concepts and process (if done by hand). However, there are a number of tools, such as Excel worksheets and plug-ins, to facilitate the process.