逻辑关系有6种。
逻辑关系，即“依赖关系”，有6种，分别是：从因到果、从主到次、从整体到部分、从概括到具体、从现象到本质、从具体到一般。因果逻辑就是符合因果关系的逻辑，指用因果逻辑来解释一个事物，探究某一事物的来源，事物的发展和事物的最终走向。
逻辑关系介绍：
辩证论全过程的数字口诀（从一到十的口诀）是本原，万物归一，形式无矛盾，属性是矛盾。一是矛盾，本质对立统，本质有矛盾，逻辑无矛盾。二是过程，左中右，两极和中介，过程论。四是系统，全面认识，系统形式，质变转化，连续运动的过程。
五是科学，两个层次，对立统一，东西南北中，重点在其中。六是立体，三个环节都是矛盾关系。七是层次，和二，一和多两个层次对立统。八是系统，层次加联系，形成系统。九是极限，九九归一，极限是十是圆满，九个环节全面把握就是圆满。
逻辑关系（logic relationship)即“依赖关系”。在项目管理中，指表示两个活动（前导活动和后续活动）中一个活动的变更将会影响到另一个活动的关系。
通常活动之间的依赖关系包括强制依赖关系（所做工作中固有的依赖关系）、可自由处理的依赖关系（由项目队伍确定的依赖关系）和外部依赖关系（项目活动与非项目活动之间的依赖关系）三种形式。
常见的八种逻辑关系如下：
1、并列关系:and, and also, or, neither…nor, either…or,likewise, similarly, equally, in the same way,that is to say, as well as, same…as
2、递进关系:then, also, besides, additionally, furthermore,moreover, in addition, what is more, indeed,even
3、因果关系:because, for, since, as, thus, hence, therefore,so, so (such) … that, so that, consequently,accordingly, according to, due to, thanks to, as a result, because of, in that, in response to/with, for this reason, lead to,too…to, with
4、转折关系:but, however, yet, on the contrary, in fact,by contrast, on the other hand, unfortunately,while, whereas, unlike, rather than, instead of,contrary to
5、让步关系:although, though, even though, even if,nevertheless, despite, in spite of
6、列举关系:first-second-last of all, first-then,to begin with-to continue/next,on one hand-on the other hand,for one thing-for another thing,one-another, some-others-still others
7、举例关系:such as, for example, for instance,of these/those/them, say,among these/those/them,to illustrate, as an illustration,to take an example,more specifically speaking, namely
8、总结关系:in all, in brief, in short, in a word, in general,in conclusion, altogether, to sum up,to summarize, to conclude, to generalize,to put it in one word, above all.
