Application of Object Oriented Systems Engineering Methodology and

Application of Object Oriented Systems Engineering Methodology and Tools for Complex Systems Vinnie Ferrando Florence Heidel Joe Marcinek Copyright, 2003 Harris Corporation. All rights reserved Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

Topics • Complex Systems – Systems Engineering Challenges • Object Oriented (OO) Systems Engineering Analysis and Design Methodology • Integrated Tools Environment • Automated Document Generation Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

Some Characteristics of Complex Systems • • Real-time Distributed, multiple processors Multiple modes and configurations System of systems – e. g. , National Airspace System (NAS) • Multiple customers - Military, Civilian, Commercial • Complex integration and test • Multiple complex interfaces – legacy and new • Transition into existing 24 x 7 operation Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

System Engineering Complex Systems • Multiple levels of specifications (CDRLs): – – • • Specs: system, subsystem, software, hardware Specialty engineering: safety, security, RMA, human factors, etc. Interfaces: ICD, IRS (new and legacy) Design and construction standards: EMI, RFI, Seismic, Fire, ISO, RTCA, ICAO, Mil-STD, FAA-STD, etc. Tens of thousands of requirements to manage System Engineering Methodology (e. g. , EIA 632) Subcontract / team member management Programmatics of development, test, manufacturing, deployment, transition, logistics, training, etc. Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

OO Systems Engineering Analysis and Design Methodology • What is OO? • OO System Engineering Approach: – Requirements/Domain Analysis – Modeling – Design Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

OO Systems Engineering Analysis and Design Methodology • OO: System is a collection of collaborating agent/objects – Object: Abstraction of real-world that contains functions and data – One object is a black box to another object – Encapsulation: Each object only needs to know how it interacts with other objects Object A doesn’t know how Object B fulfills its request; it only cares about the interaction with B. 1) Requests Data from Object B Object C Applications of OO System Engineering Methodology and Tools for Complex Systems Object B 2) Object B needs data from Object C to fulfill Object A request 3) Requests Data from Object C 10/2/2020

OO Systems Engineering Analysis and Design Methodology • Analysis – Use Case-Based Analysis Methodology – Define what the system needs to do from a user’s/actor’s perspective • Define all of these functions based on customer requirements System Analog Voice Uplink TDMA Voice TDMA Packet Confirmation Air Traffic Controller Applications of OO System Engineering Methodology and Tools for Complex Systems Aircraft 10/2/2020

OO Systems Engineering Analysis and Design Methodology • Modeling – Model the system to define lower-level objects – Depending on complexity of system, various levels of analysis are needed System Analog Voice Uplink TDMA Voice TDMA Packet Confirmation Aircraft Air Traffic Controller Analog Voice Confirmation Subsystem 1 Subsystem 2 Vocode Voice Schedule Packet Data Packet Air Traffic Controller Applications of OO System Engineering Methodology and Tools for Complex Systems TDMA Packet Aircraft 10/2/2020

OO Systems Engineering Analysis and Design Methodology • Example: Modeling using Sequence Diagrams – Emphasize sequence of events – Depict concurrent operations, which are invaluable for hunting down race conditions – Capture the time component of interactions between entities at the system and subsystem levels Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

OO Systems Engineering Analysis and Design Methodology Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

OO Systems Engineering Analysis and Design Methodology • Use Cases drive analysis approach for specifying requirements – Use Cases are detailed, structured, text-based descriptions of interactive usage – Use Cases have overview, pre- and post- conditions, issues and assumptions for the main flow and alternative flows – Use Case Analysis and Requirements Generation is an iterative process to handling complex system – Use Case Analysis at system level, subsystem level as well as process level provides all required capabilities Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

OO Systems Engineering Analysis and Design Methodology • Requirements Management – Requirements management is closely linked to modeling – Define lower-level requirements based on models • Use Case steps become SHALLs for each level of analysis • Levels of requirements are incorporated into the appropriate CDRL level and allow for customer review • Defense/Government customers require this strict linkage – Completeness, consistency, and traceability are attributes of this methodology – Supplementary requirements are added to the requirements management effort (e. g. , Security, Safety, Power, etc. ) Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

OO Systems Engineering Analysis and Design Methodology • Design – Requirements and models lead to design – Objects are allocated to subsystems – Lowest-level objects become design objects • Objects will be used for software coding or hardware functionality • Interaction between objects may become software methods/operations Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

Integrated Tools Environment • What is required in an integrated tools environment? – Management of Systems Engineering processes – Integration of Systems Engineering processes ? Requirements Management Modeling Test Applications of OO System Engineering Methodology and Tools for Complex Systems Change Management Too difficult to manage! Configuration Management 10/2/2020

Integrated Tools Environment • Goal: Leverage technology to integrate processes – Changes in one area prompt change in other affected areas Requirements Requisite Pro Management Modeling Rose Test Manager Applications of OO System Engineering Methodology and Tools for Complex Systems Clear. Quest Change Management Configuration Clearcase Management 10/2/2020

Integrated Tools Environment • Example Approach – One-tool vendor – Vendor integrates well with existing MS Office Suite – Tools build on methodology…they do not define the methodology – Use tools designed around OO methodology – Documented and enforced processes Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

Integrated Tools Environment • The process in action: Action Item is Created Action Item is Linked to Requirement Action Item is Created Requirement linked to model…model is changed Requirement is changed Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

Automated Document Generation • Why Automated Document Generation? – More time engineering, less time documenting – Documents are directly linked to analysis source – Easier review • Example: Rational So. DA – Scripting language in MS Word to extract documentation from many sources: • • Rose Requisite Pro Clearcase Clearquest MS Word MS Project Others Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

Automated Document Generation • So. DA scripts used to generate the following: – Customer Deliverables – Review Packages – Reports for Analysis Requisite Pro Rose Clear. Quest Test Manager So. DA pulls together integrated data. Clearcase Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

Summary Results • Why OO and this approach? – Systems are becoming increasingly more complex • Better tools and techniques are needed to manage development – Detailed analysis up-front saves time and cost, ultimately reducing risk when you are ready to build – Breaks complex system into manageable pieces • With sufficient analysis, developer needs to only understand assigned objects and how they must interact with other objects…not the whole system – Tools designed to support this methodology help you manage development Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020

Contact Information Harris Corporation 407 John Rodes Blvd. PO Box 9800 Melbourne, FL 32902 -9800 • Vinnie Ferrando, 321 -309 -7120, Vincent. Ferrando@Harris. com • Florence Heidel, 321 -309 -7130, Florence. Heidel@Harris. com • Joe Marcinek, 321 -309 -7131, Joseph. Marcinek@Harris. com Applications of OO System Engineering Methodology and Tools for Complex Systems 10/2/2020