Model Based System Engineering tutorial with ATM system

We have 6 steps. Step 1 is described in this page.

Step 1: define a requirement meta model

Step 2: import or reference system requirements

Step 3: refine system requirements through a SysML model

Step 4: allocate functions on components in SysML

Step 5: finalize traceability with subsystem requirements

The goal of this first step is to define a classification of requirements: types and associated attributes, and scopes (levels). when this classification is done, we can import, create trace requirements and put elements in the classification.

Requirement meta model is a configuration. It is done in ReqCycle preferences. You can access preferences from top menu "ReqCycle" and sub menu "ReqCycle preferences".

Creation of a data model

Go to data models preferences and create a new requirement data model "MyReqDataModel" with "+" button

Creation of requirement typesl

Go to "RequirementTypes" preference (below data models) and select "MyReqDataModel" data model. Now create a new Requirement type "Functional" with "+" button

And continue by creating custom requirement attributes for type "Functional". Select "Functional" requirement type and then create new attribute with "+" button.

Create "revision" and "status" both of type "String" and "derived" of type "boolean".

Now let us create two other requirement types : "Safety" and "Security". For safety type, add same custom requirements than for functional, with additional "SafetyLevel" of type "String". For security type, add same custom requirements than for functional, with additional "SecurityLevel" of type "String".

Note: Enum types can be defined in ReqCycle and used as attribute types, but for now there are restrictions on enums for some requirement import wizards. So here we use "String" as a workaround. In future releases, we will be able to use enums.

Creation of requirement scopes

Go to "Scope" preference (below data models) and select "MyReqDataModel" data model. Now create a new scope "System" with "+" button

Note: we will create other scopes later in this tutorial, one for each subsystem.

Now apply all modifications by clicking "OK" button on the bottom part of the preferences.

ReqCycle informs that you it will restart. Say Yes.

After restart, go to ReqCycle preferences again and check that your data model is complete : three requirement types, one scope.

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Step 2: import or reference system requirements

[back to ReqCycle wiki main page: https://polarsys.org/wiki/ReqCycle]