SAMIHA TABASSUM HAQUE (TP034305) 54 ONLINE PATIENT SCHEDULING SYSTEM 4.3.4 Activity Diagram Figure 32: Activity Diagram for Online Patient Scheduling System. 4.3.5 Sequence Diagram First Version: 55. SAMIHA TABASSUM HAQUE (TP034305) 55 ONLINE PATIENT SCHEDULING SYSTEM Figure 33: First Version of Sequence Diagram..