jgs Spring 2022 | 00001101 Use Case Template Number and Name < the name is the goal as a short active verb phrase> Goal / Description < a longer statement of the goal in context if needed > Pre-conditions Success End Condition
Failed End Condition
Actors
Trigger Description step action 1 from trigger to goal delivery, and any cleanup after> 2 <...> 3
jgs Spring 2022 | 00001101 Number and Name < the name is the goal as a short active verb phrase> Goal / Description < a longer statement of the goal in context if needed > Pre-conditions Success End Condition
Failed End Condition
Actors
Trigger Description step action 1 from trigger to goal delivery, and any cleanup after> 2 <...> 3 Use Case Template
jgs Spring 2022 | 00001101 Example: insulin pump Insulin Pump/Control Software/SRS/3.3.2 Function Compute insulin dose: safe sugar level. Description Computes the dose of insulin to be delivered when the current measured sugar level is in the safe zone between 3 and 7 units. Inputs Current sugar reading (r2); the previous two readings (r0 and r1). Source Current sugar reading from sensor. Other readings from memory. Outputs CompDose—the dose in insulin to be delivered. Destination Main control loop. Action CompDose is zero if the sugar level is stable or falling or if the level is increasing but the rate of increase is decreasing. If the level is increasing and the rate of increase is increasing, then CompDose is computed by dividing the difference between the current sugar level and the previous level by 4 and rounding the result. If the result, is rounded to zero then CompDose is set to the minimum dose that can be delivered. Requirements Two previous readings so that the rate of change of sugar level can be computed. Pre-condition The insulin reservoir contains at least the maximum allowed single dose of insulin. Post-condition r0 is replaced by r1 then r1 is replaced by r2. Side effects None. Number Name Goal/ Description Pre-conditions Success End Condition Failed End Condition Actors Trigger Description
jgs Spring 2022 | 00001101 Behavioral Modeling Supplements the use case by providing § a graphical representation of the flow of interaction. Create an activity diagram for each use-case. § a list of the different states of a system. Build a state diagram for the system. They are not mandatory, and they can be combined.
jgs Spring 2022 | 00001101 Activity Diagram § Supplements the use case by providing a graphical representation of § the flow of activities § the sequence from one activity to another. § the parallel, branched and concurrent activities § indicate which actor (if there are multiple actors involved in a specific use- case) has responsibility for the action described
jgs Spring 2022 | 00001101 Key elements § rounded rectangles represent actions; § diamonds represent decisions; § bars represent the start (split) or end (join) of concurrent activities; § a black circle represents the start (initial node) of the workflow; § an encircled black circle represents the end (final node). § Arrows run from the start towards the end and represent the order in which activities happen. § Swim lane or functional band helps to visually distinguishes job sharing and responsibilities
jgs CSE 563 Software Requirements and Specification Javier Gonzalez-Sanchez, Ph.D. [email protected] Fall 2021 Copyright. These slides can only be used as study material for the class CSE563 at ASU. They cannot be distributed or used for another purpose.
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