In thinking about or looking for a causality relationship researchers have to decide if they are dealing with a necessary condition. A necessary condition is one that must be satisfied for the statement to be true. A sufficient condition is one that, if satisfied, guarantees the statement will be true. Some conditions can be both necessary condition and sufficient condition. A necessary condition is that which must be present for the effect to occur. To put it another way, if B appears then A must have been present. Social sciences seldom deal with necessary conditions, rather they are happy to find sufficient conditions.
A necessary condition must be there, but it alone does not provide sufficient cause for the occurrence of the event. Only the existence of sufficient grounds can do this.
Being alive is a necessary condition for having a right to life. Being alive is a suffcient condition for having a right to life.
A Necessary Condition for the Existence of SW-Monopoles.
Is autonomic dysfunction a necessary condition for chronic peptic ulcer formation?
Risk Aversion a Necessary Condition for Limiting Global Environmental Risks?
Is wage compression a necessary condition for firm-financed general training?
Quantization as a Necessary Condition for Gauge Invariance.