ITU-T SERIES E.300 SUPP 5-1984 实验测试设计模型决定为没有经验的用户建立全国范围内使用可用的指令或比较不同的指令集国际电话
Modelling of an experimental test design for the determination of inexperienced user difficulties in setting up international calls using nationally available instructions, or to compare different sets of instructions
The objects of the tests are to obtain information on inexperienced user difficulties and to test the efficacy of different forms of instruction available for use in any country by observing,in a controlled laboratory environment,ordinary telephone users dialling live international calls.