Aggression is not easily defined as it consists of many facets. As a noun, aggression has the intent to harm. As an adjective, aggression can describe an action made with persistence and intent according to Lloyd et al. (1984: cited in Gross, 1992). Aggressive behaviour is predominantly the object of study as it is easier to observe and thus measure, than the emotion behind the intent to behave aggressively. There are also different types of aggression. Hostile aggression is to cause harm for the sake of it, whilst instrumental aggression has a purpose, such as self-defence, as written by Buss (1961: cited in Gross, 1992). Comment by Psychology Marker: Good to define key terms near the beginning.
Different factors can lead to a person behaving aggressively. There are _situational factors_, which is the environment you are experiencing, and _personal factors_, which are collectively unique to each person. But knowing these factors are not enough, the links between the factors and the aggressive behaviour are also important. To evaluate this link, there are two main schools of thought when it comes to the theories of aggression. The social theories consider aggression to be a
References: Berkowitz, L. & LaPage, A. (1967). Weapons as aggression-eliciting stimuli. _Journal of Personality and Social Psychology_, 7, 202-207. Bushman, B. J. & Baumeister, R. F. (1998). Threatened Egotism, Narcissism, Self-Esteem, and Direct and Displaced Aggression: Does Self-Love or Self-Hate Lead to Violence? _Journal of Personality and Social Psychology, 75,_ 219-229. Crisp, R. J. & Turner, R. N. (2010). _Essential Social Psychology (2nd Ed)_. London: SAGE Publications. Cohn, E. & Rotton, J. (1997). Assault as a function of time and temperature: A moderator-variable time-series analysis. _Journal of Personality and Social Psychology, 72,_ 1322 - 1334. Dollard, J., Miller, N. E., Doob, L. W., Mowrer, O. H. & Sears, R. R. (1957) _Frustration and aggression._ New Haven: Yale University Press. Gross, R. D. (1992) _Psychology: The science of mind and behaviour._ London: Hodder and Stoughton. Hogg, M. A. & Vaughan, G. M. (2011). _Social Psychology (6th Ed)._ London: Pentice Hall. Lawrence, C. & Andrews, K. (2004). The influence of perceived prison crowding on male inmates ' perception of aggressive events. _Aggressive Behaviour, 30,_ 273 - 283. Mummendey, A. (1996). Aggressive behaviour. In M. Hewstone, W.Stroebe & G. M. Stephenson (Eds.), Introduction to social _psychology_ (pp. 403-435). Oxford: Blackwell Publishers Ltd. Reynolds, T., Zupanick, C.E. &Dombeck, M. (2013) _Behavioural Psychological Features of Intellectual Disabilities._ Retrieved October 20th, 2013, from http://www.mentalhelp.net/poc/view_doc.php?type=doc&id=10328&cn=208 Storr, A Wall Jr., J. A. & Callister, R. R. (1995) Conflict and Its Management. _Journal of Management, 21,_ 515-558.