Example of causality diagram

Some commonly used fixed symbols:

C: The reason (cause); Ef: Represents the result (effect); equality:; Non:; with:; or:;

E: Exclusive (exclusive); i:at least (inclusive); r:require; o:only one; M: Force tag (marking);

Instance:

There is a vending machine software that handles boxed drinks with a unit price of 1.5 yuan. If you invest 1.5 yuan coins, press "Cola", "Sprite", or "black tea" button, the corresponding drink will be sent out. If you invest in a 2-dollar coin, return the 5-point coin at the same time you send the drink.

Reason Number	Content
C1	Invest 1 yuan 5 Corner coin
C2	Invest 2 yuan coins
C3	Press the "Coke" button
C4	Press "Sprite" button
C5	Press the "Black tea" button

Result number	Output	Demand
Ef1	Retreat 5 angle	C2∧ ( c3 ∨ c4 ∨ C5
Ef2	Send "Coke"	(C1∨C2) ∧C3
Ef3	Send "Sprite"	(C1∨C2) ∧C4
Ef4	Send "black tea"	(C1∨C2) ∧C5

Intermediate state	Content
1	Coins have been put into
2	The button has been pressed

∨

Example of causality diagram