It is hypothesised that male adolescents will obtain higher assertiveness levels than females in the Northern Territory. A quantitative observational design will be conducted to identify and measure assertiveness levels in the absence of extraneous variables such as the social desirability effect. Subjective quantitative data will be collected from this observation as the results are based upon participants’ opinions, but the data is numerical. The investigation will consist of adolescents collected from an Essington Stage 2 psychology class. They will receive a consent from, clearly labelling the research intentions and how the investigation will be conducted. All participants who voluntarily agreed to participate will be given a behaviour questionnaire to complete. From this raw data, both the mean and median will be calculated, and the most accurate measure of central tendency will be used for the results. The data collected will help future researchers further understand assertiveness levels in adolescents, and if one gender is naturally higher. This knowledge can help with psychological interventions such as Assertiveness training, and Cognitive Behavioural Therapy, in understanding assertiveness further and developing methods to increase it. If the hypothesis is supported, the results will show that male adolescents have a higher mean or median assertiveness score than females.