It's also very easy to plug in new expression evaluators for things like mvel, ognl, or jruby.

为mvel、ognl或者jruby等增加新的表达式计算插件也是非常容易的。

youdao

These guidelines aim to assist programme sectors and field offices in the selection of evaluators for external and internal evaluations.

UNESCO: Evaluation Guidelines | United Nations Educational, Scientific and Cultural Organization

Additionally, there are industry organizations, such as the Mystery Shopping Providers Association, National Association for Retail Marketing Services, and International Association of Service Evaluators, where shoppers can view directories of member companies.

FORBES: How I Made $14,000 A Year Mystery Shopping