3. Methodology There are three important research methodological paradigms: quantitative, qualitative and mixed method. 3.1 Quantitative Method (QUAN) QUAN can, to put it simply, be defined as the techniques that involve data collection, analysis, interpretation and communication of numerical information in sequential order. The QUAN researcher is dedicated to the principles of positivism – the view that “Explain phenomena by collecting numerical data that are analyzed using mathematical (especially statistical) methods.” Aliaga and Gunderson (2000). One of the advantages of quantitative research is that it requires less time. That is: The data can be collected in a simpler way, for example by sending or receiving via email and/or post, distributing or collecting from certain people so that the data can be analyzed quite quickly. A survey with this method can also be quickly generalized to the entire population using statistically random samples. Quantitative quantity can provide a reliable set of data that gives confidence if the information is constant and reliable. The survey can be conducted anonymously when it concerns sensitive topics. Protects privacy. Certainly, the goal of generalizing the results in the target group can be achieved. However, quantitative research may not be able to investigate the issue while respondents answer closed-ended survey questionnaires. Even if they are willing to share experiences or opinions, their responses may not be useful to researchers. At worst, misunderstandings or inaccuracies create potential biases in the study. New information is unlikely to be discovered, but the important attitude, if present, can be overlooked. In case the research study involves a large quantity of samples, it may be expensive.3.2 Quality...... half of the paper ......ds does it count per building or per square metre? Therefore, the sampling proportion in different property types is based on the perception resulting from the team discussion. The selection criteria include: popular type of real estate, low-income group, often dealing with people (tenants, residents, occupants, users etc.). Self-Reported Data Another limitation is that the data collected for this research study can hardly be independently verified. That is: both the interviewees and the respondents to the questionnaires may contain some potential bias, i.e. a low level of perception on the part of the interviewees (the target population is security guards who generally have a low level of education, their understanding of the terms in questionnaires may not be accurate. So, we will compare this QUAN data with the QUAL data. In case there is a significant difference, something must be wrong.