Modeling Message-Based Behavior with Interactions in Sequence Diagrams

Sequence diagram = represents an interaction; can only show interactions so model element type: interaction; in form: sd [Interaction] interaction name [diagram name] [1] What is the diagram kind for a sequence diagram, and which type of model element does it represent? A = sd / interaction only; [2] What is the context for an […]

Modeling Cross-Cutting Relationships with Allocations

Allocation = mechanism to relate model elements (build relationships); useful for system of systems (SoS); supports allocation of behavior, structure and properties; functional allocation = allocation of activities to blocks; Allocation relationship = between any named model elements; Model element A is allocated to Model element B when from-end of allocation relationship is A and […]

Parametric Diagrams

Parametric Diagrams (par) = used to express information about system’s constraints. Recall that a constraint block = special kind of block that encapsulates constraint expression; equation or inequality. This enables the following abilities: – Specify assertions of valid system values (thereby detecting exceptional conditions) – Provides inputs and outputs for engineering analysis and simulation during […]

Modeling Constraints with Parametrics

Parametric models capture the constraints on the properties of the system; expressed as equations; uses bdd to define constraint blocks; the header follows format: par [model element type] model element name [diagram name] [6] How are constraint properties represented on a parametric diagram? ANS: 7.2 [7] How are constraint parameters represented on a parametric diagram? […]

State Machine Diagrams with Transitions and Pseudostates

State Machine (stm) = behavior diagram, how a structure within system changes state in response to event occurrences over time. This is not the same as state machine diagram (can have multiple diagrams for single state machine). State machine is the namespace, a set of named elements.   Classifier behavior = behavior that begins executing […]

Sequence Diagrams with Lifelines, Constraints and other Specifications

Sequence diagrams (sd) = used to express information about system’s dynamic behavior, by using elements called lifelines to model participants in the system behavior and use messages between lifelines to model the interactions. This view expresses sequences of behaviors and events over time. This is an ideal diagram when wanting to display how blocks interacts […]

Requirements Diagrams with Allocations

Requirements Diagram Use to be text-based requirements (and requirements specifications in them) traditionally. This can be represented through the requirements diagram (req). It traces requirements to the elements in the system model. Requirement = rectangle with stereotype <<requirement>> preceding the name and two properties, id and text, both of type string. SysML only requires these […]

Modeling Text-Based Requirements and Relationship to Design

Requirement = capability or condition that must be met by a system, or a performance condition the system must achieve; similar requirements are grouped into a specification; requirements can be shown graphically or tabular, or in compact graphical notations in any SysML diagram. Uses <<requirement>> model element; [1] What is the abbreviation for a requirement […]

Package Diagrams, Hierarchy and Importing

Package Diagrams Package diagram (pkg) = displays the organization of the system model based on package hierarchy where packages could be nested within each other. Namespace = model element that is allowed to contain other named elements, included nested elements. A model = one of four specialized kind of packages, this serves as the root […]

Modeling Flow-Based Behavior with Activities

Activity Diagram = frame represents an activity; [1]What is the diagram kind of the activity diagram?diagram kind of “act” for activity; has following form: act [Activity] activity name [diagram name] Activity name = name to represent the activity; Diagram name = user defined name to describe purpose of diagram;   [2]How are an action and […]

Activity Diagrams and Properties

Activity Diagram (act) = one of three ways to express information about system’s dynamic behavior (activity, sequence, state machine), it’s a dynamic view of the system that expresses sequences of behaviors and event occurrences over time. (whereas a structure diagram like BDD, IBD and parametric diagrams show static views that convey no sense of time […]

Activity Modeling and relating to Block Diagrams

Interruptible region = subset of actions within activity that can interrupt execution of activity via interrupting edge; noted by dashed line around activity nodes; an interrupting edge is noted by lightning bolt symbol; [21] interrupting edge node is within the interruptible region and this has to be triggered to exit the interruptible region;     […]

Block Definition Diagrams and Behaviors

The most common SysML diagram is BDD, which includes elements such as blocks, actors, value types, constraint blocks, flow specifications and interfces. Elements of Definition = the elements of a BDD, which are the foundation of everything else, contains the structural relationships, associations, generalizations and dependencies BDD should be created often = created when stakeholder […]

System Modeling Language (SysML) Overview

SysML = broad and richly expressive graphical language with aspects of system’s design: structure, behavior, requirements, parametrics (mathematical models) SysML grammar and notations are defined by OMG (Object Management Group) SysML is extension of UML and as such, some SysML rules are actually defined in UML specification document (ie ValueType is derivative of DataType) Nine […]

Model Based Systems Engineering Introduction

Systems Engineering Overview SysML = System Modeling Language INCOSE = International Council of Systems Engineering SysML = Object Management Group’s (OMG) SysML = general purpose graphical modeling language for representing systems that may include hardware, software, data, people, facilities and natural objects. Supports practice of model-based system engineering (MBSE). Systems engineering = multidisciplinary approach to […]