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Table 5 Obtained decision tree after applying the ID3 algorithm on the content category of usability data (target attribute Multi_Language with possible values {yes, no, sometimes}) (visualization provided by WEKA platform)

From: Qualitative usability feature selection with ranking: a novel approach for ranking the identified usability problematic attributes for academic websites using data-mining techniques

Scope_of_Multi_Language = no  
 | Date_of_Last_Update_Available = no
 | | Online_User_Feedback = no
 | | | Communication_with_Site_Owner = no: no
 | | | | Communication_with_Site_Owner = sometimes: no
 | | | | Communication_with_Site_Owner = yes
 | | | | | News_Comprehensibility = yes
 | | | | | | Contact_Data_Available = yes: no
 | | | | | | Contact_Data_Available = sometimes: no
 | | | | | | Contact_Data_Available = no: null
 | | | | | News_Comprehensibility = no: no
 | | | | | News_Comprehensibility = sometimes: no
 | | | | Communication_with_Site_Owner = sometimes: null
 | | | Online_User_Feedback = sometimes: no
 | | | Online_User_Feedback = yes
 | | | | Communication_with_Site_Owner = no
 | | | | | Contact_Data_Available = yes: yes
 | | | | | Contact_Data_Available = sometimes: null
 | | | | | Contact_Data_Available = no: no
 | | | | Communication_with_Site_Owner = yes: no
 | | | | Communication_with_Site_Owner = sometimes: null
 | | Content_Up_To_Date = sometimes: no
 | | Content_Up_To_Date = no: no
 | Date_of_Last_Update_Available = yes
 | | Communication_with_Site_Owner = no: no
 | | Communication_with_Site_Owner = yes
 | | | Contact_Data_Available = yes
 | | | | Content_Up_To_Date = yes
 | | | | | News_Comprehensibility = yes
 | | | | | | Content_Up_To_Date = no: no
 | | | | | | Content_Up_To_Date = sometimes: null
 | | | | | | Content_Up_To_Date = yes: no
 | | | | | News_Comprehensibility = no: no
 | | | | | News_Comprehensibility = sometimes: null
 | | | | Online_User_Feedback = sometimes: no
 | | | | Online_User_Feedback = no: null
 | | | Contact_Data_Available = sometimes: null
 | | | Contact_Data_Available = no: no
 | | Communication_with_Site_Owner = sometimes: no
 | Date_of_Last_Update_Available = sometimes
 | | Communication_with_Site_Owner = no: no
 | | Communication_with_Site_Owner = yes
 | | | Online_User_Feedback = no: no
 | | | Online_User_Feedback = sometimes: null
 | | | Online_User_Feedback = yes: sometimes
 | | Communication_with_Site_Owner = sometimes: no
Scope_of_Multi_Language = yes
 | Communication_with_Site_Owner = no
 | | Date_of_Last_Update_Available = no: yes
 | | Date_of_Last_Update_Available = yes: sometimes
 | | Date_of_Last_Update_Available = sometimes: null
 | Communication_with_Site_Owner = yes
 | | Date_of_Last_Update_Available = no: no
 | | Date_of_Last_Update_Available = yes: yes
 | | Date_of_Last_Update_Available = sometimes: yes
 | Communication_with_Site_Owner = sometimes
 | | Online_User_Feedback = no: null
 | | Online_User_Feedback = sometimes: no
 | | Online_User_Feedback = yes: yes
Scope_of_Multi_Language = sometimes
 | Communication_with_Site_Owner = no: yes
 | Communication_with_Site_Owner = yes
 | | News_Comprehensibility = yes: yes
 | | News_Comprehensibility = no: no
 | | News_Comprehensibility = sometimes: no
 | Communication_with_Site_Owner = sometimes
 | | Content_Up_To_Date = yes: yes
 | | Content_Up_To_Date = sometimes: no
 | | Content_Up_To_Date = no: null