The discussion chapter of your thesis requires attention to issues that have not concerned you in earlier chapters of your thesis:

• In the Literature Review you were solely concerned with previous research.
• In the Methodology and Results chapters you have been solely concerned with describing your own research.
• In the discussion chapter, however, you must combine the previous research and your own findings.

The skill in writing a successful discussion is in manipulating other's research and your own research and making it clear which is done by other people and which has been done by you AND how they complement each other. So how do you differentiate your own research from other previous research:

• You might use the first person to describe your findings, e.g. 'My data show...';
• You might need to consistently refer to your own research as 'This study..' 'The findings of this research...' and referring to previous research as by name, place or time: 'Smith and Geva found that...'; A previous study in Belgrade...'; 'Similar research carried out in the 1980s showed that...'.
• You might need to consistently refer to your own research in the present tense and other research in the past, e.g. 'This study shows a prevalence rate of 2.5 which is greater than that found by Smith and Geva in their Belgrade study...' Alternatively you might use the present perfect to highlight the recent relevance of your research in comparison with earlier research which would then be placed in the simple past: 'This study has shown a prevalence rate of 2.5 which is greater than that found by Smith and Geva in their Belgrade study...'

• Your own findings
• What others have found
• How your findings and other's findings relate to each other.