因果法：谜面和谜底互为因果关系而相扣。大力改造沙漠（猜画家名三）谜底：洪荒、方成、苗地，这里显而易见，谜面是因，谜底是果。
主张运用经验法、因果法、归纳法、尝试法来进行系统分析。
Experience method, low of causality, inductive method and try-and-error method could be used in system analysis.
很多研究员都指责案例对照法不是展现因果关系直接有力的方法，尤其因为它受制于大量的记忆误差。
Many researchers fault case-control work as being a weak method for showing direct causality, especially because it is subject to substantial recall bias.
为揭示气候变化并探索其可能原因，引入了格兰杰因果检验法。
For revealing and exploring climate change and its causes, Granger causality test is introduced in this paper.
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