Final answer:
The factor not included in the fraud triangle is 'ethical behaviour of an individual'; the fraud triangle consists of pressure, opportunity, and rationalization.
Step-by-step explanation:
In the context of the fraud triangle, the factor that is not included is 'ethical behaviour of an individual'. The fraud triangle consists of three key factors that contribute to fraudulent behaviour: pressure (or motivation), opportunity, and rationalization. An individual might experience pressure from various life circumstances, such as financial difficulties or unrealistic performance expectations. The opportunity to commit fraud generally arises when there is weak internal control or the ability for someone to exploit their position of trust to gain access to assets. Lastly, rationalization is a mental process fraudsters use to justify their dishonest actions, often by seeing themselves as deserving or perceiving the behavior as harmless or justified in the context of their situation.
The factor 'materiality of the assets' could be related to the opportunity aspect, as it deals with the value of the assets that could be fraudulently obtained, but does not alone constitute a side of the fraud triangle.