This provides reasons as to why the nine-year-old boy has a high light sensitivity as well as the extensive lesions around the face. Initially, I searched each symptom separately, looking for definitions for them. I used ‘Google’ to find these but found that the definitions were not all related. I then used ‘Medilexicon’ to find out what each symptom meant and then ‘Google Images’ to have an idea of what they would look like. Following this, I started to search the symptoms such as “squamous cell carcinoma” but was led to websites that did not match the case study. I then combined multiple symptoms in the same search e. g. “skin lesions and pigmentation and photophobia” on ‘Google Scholar’ in order to find scientific articles in which I did. These articles linked the symptoms to Xeroderma pigmentosum as they showed individuals of a similar age displaying identical features of this disease. I compared the images I found earlier to ones in the articles I had seen to ensure that they were correct. Once I was able to diagnose the condition, I needed to find the explanation as to how this disease occurs. I used ‘Google’ to search the disease but was again led to websites that were of no relation to the case study.As a result, I used the Queen Mary online library to search “Xeroderma pigmentosum” to find articles which could provide detailed descriptions on what XP is and how it occurs. I managed to find a few articles which had explanations, but these were quite complex, so I combined the use of more simple definitions in order to summarise the underlying biological process which is not functioning correctly in the disease.