Table 2 Place and transitions for question answer system
From: Threat driven modeling framework using petri nets for e-learning system
Place number | Place description | Transition number | Transition description |
|---|---|---|---|
P0 | User login | T0 | Authenticate |
P1 | Authenticated/authorized | T1 | Go to main page |
P2 | System ready state | T2 | Enter an objective question |
P3 | Objective question asked | T3 | Search if a direct objective answer exists |
P4 | Direct answer yes/no | T4 | Enter a subjective question |
P5 | Subjective question asked | T5 | Search if a direct subjective answer exists |
P6 | Direct answer yes/no | T6 | Searching the data in objective question knowledge base |
P7 | Data found | T7 | Create the answers |
P8 | Answer formed | T8 | Select from the answers |
P9 | Answer selected | T9 | Display an answer |
P10 | Response displayed | T10 | Getting response from answers |
| Â | Â | T11 | Exit |
| Â | Â | T12 | Decrypt answer formation decision and retrieve direct response for objective |
| Â | Â | T13 | Decrypt answer formation decision and retrieve direct response for subjective |