16
Chapter 3
Methodology
3.1 Research Method
The method that is used in this research is Waterfall Method. Waterfall Method is systematic and sequential method. Figure 3.1 is showed the structure of Waterfall Method.
Figure 3.1 the Structure of Waterfall Method (Sommerville, 2004)
3.1.1 Requirement analysis
17
what kind of specification of mobile phone that user need. Figure 3.2 is the format of the questionnaires and figure 3,3 shows the result of the early reseach.
Figure 3.2 Questionnaire format of early research
In previous research about Extended Weighted Tree Similarity, Yulianti (2010) had suggestion for next research about the application of that algorithm to make it become online application because online application can update the data automatically if the source is updated. Figure 3.3 shows the example of visualization of XML tree of mobile phone that is used by this algorithm.
Figure 3.3 Result of the questionnaire
So, form the analysis from the previous research about the system and algorithm above, it can be concluded that
Dalam memilih mobile phone yang akan anda beli, factor apa saja yg anda pertimbangkan?
1. Harga 2. Vendor 3. Fitur
18
what is needed in this research is online recommender system that applies Extended Weighted Tree Similarity Algorithm. requirement for the next step.
The first step of the application is inputting criteria by the user/ user. These criteria will be built into XML tree by the system. And because the algorithm also considers the weight of the criteria, so the user not just input the criteria but also the weighted of every criterion that they input.
Figure 3.4 Use Case Diagram
The second step is searching the mobile phone from web page, in this case from Tabloid Pulsa site page. The user cannot do the second step before finished the first step because the third step, which will run automatically after the search is done, is need XML tree from user input to compare with XML tree of mobile phones from search result use Extended Weighted Tree Similarity and give recommend based on the count result of the algorithm.
19
Diagram of Show Search Result show the detail how the algorithm work behind to process the recommendation for user from comparison between XML tree from user input and from web page.
Figure 3.5 Activity Diagram of Input Criteria
There is a little bit difference in Figure 3.5 and Figure 3.6, in process after the building XML tree.
20
XML tree from web page need to save in a collection because there will be more than one XML tree that can be created from web page. One mobile phone will be represented by one XML tree. After finished the search, the system will be query all XML trees on the collection and compare its one by one with XML tree from user input to count the similarity. It can be seen in Figure 3.7 Activity Diagram of Show Search Result.
.
Figure 3.7 Activity Diagram of Show Result
21
process work behind by the system and the system just need the user to fill the criteria, including set the number of mobile phone to be compare with their criteria and press search button to initiate the starting of the search. The rest process will run automatically after it.
Figure 3.8 Sequence Diagram
22
Although most of process are run by system, but process that has user interaction also important. So, this system need user friendly’s user interface. On Figure 3.10, its can be seen the main form of the application, where all the process is started.
Figure 3.10 Main Form
There are 3 main criterias:
23
other forms, Price and Vendor, there is no other sub criteria under both of them. User also can decide the weighted of every sub criteria.
Figure 3.11 Price Form
Figure 3.12 Vendor Form
24
Figure 3.13 Feature Form
25
under the feature is depended of the feature classification on the Tabloid Pulsa’site.
The next step of waterfall method,
