Leadership behavior and collective efficacy should be regarded as groupvariable, and role involvement should be regarded as personal variable.
领导行为、集体效能更应该看作是群体水平的预测变量，角色投入更应该看作是个体水平的预测变量。
2
Additionally, if you don't want to involve the group variables in the process input variable, you can use an event handler in the process to fetch such information when needed.
此外，如果您不想在流程输入变量中介入组变量，可以在流程中使用一个事件处理程序来根据需要获取该信息。
3
Otherwise, statisticians say only strict clinical trials with a control group and a test group and one variable can truly prove a cause-and-effect association.