Chapter 22 Product Line Engineering Week 1 CIS 673

Product Line Engineering What is Software Engineering? What is Software Reuse? Why Reuse Software? Why Not Reuse Software? What is Product Line Engineering?

Software Engineering Engineering Discipline of Software specification, development, evolution, maintenance, operation. Evolved from the mid fifties. Constant state of crisis. SW products: increasingly large, increasingly complex, increasingly critical.

Traditional SE Lifecycle Phases Feasibility Analysis Req Specs Design Product Design Detailed design Programming Testing Operation and maintenance Sequential, chronological. Reinventing the wheel, over and over

What is Software Reuse Set of systematic, organization-wide measures that are taken to streamline the production and usage of reusable software components in application development.

Why Reuse Software Reuse: an Intrinsic part of any engineering discipline. Lower Costs. Better quality. Shorter Time to Market. Less process risk.

Why Not Reuse Software SW components too information rich. Little chance of a match. Great variability in user needs. Not Invented Here syndrome. Architectural mismatches: there is more to a component than function. ….. Failure of Reuse as a Broadly Applicable mechanism. Huge reuse libraries went idle…

Why Not Reuse Software, II SW products have no standard architecture. Analogy with automobiles: standard architectures Cottage industry of parts manufacturers New cars made up, in large parts (98%), of reusable parts In SW:

Product Line Engineering A Streamlined Form of Software Reuse Domain specific Centered on an Architecture Captures Domain Knowledge, Assumptions, wisdom, etc

Two Phases Domain Engineering: Domain Analysis, domain scoping, domain architecture, analysis of commonality and variability, design for reuse, etc. Application Engineering: Developing applications from DE deliverables.

Team Organization

1.2.5 The Experience Factory Definition Characterize Set Goals Choose Process Analyze Execute Process Project Support Experience Base Generalize Tailor Formalize Package PROJECT ORGANIZATIONEXPERIENCE FACTORY Environment Characteristics Goals, Processes, Tools, Products, Resource Models, Defect Models, Data, Lessons Learned Project Analysis Execute Plan

Experience Factory: A Special Form of Team Producer Reusable Assets – Among the forms of assets, we mention: equations between process or product parameters; histograms or pie charts of project data; ranges of normal project data; lessons learned from past development projects

Experience Factory: A Special Form of Team Producer Packaging – product packages, which are abstractions of lifecycle products (programs, designs, architectures, specifications, test data) – process packages,which are abstractions of lifecycle processes (process models, methods, test data generation method) – relationship packages, which abstract relations between various product parameters and process parameters (cost models, defect models, reliability models) – tool packages, which assist the generation or analysis of software products and processes (code generators, planning and cost estimation tools, static analyzers, regression testers).

Experience Factory: A Special Form of Team Producer Separation of Producer and Consumer Functions – Unlike all other organizations we have discussed so far, the experience factory organization has no cognizance of the multitude of project teams. Also, the project organization is not expected to make any direct contribution to the corporate experience base.

Product Line Engineering (PLE) Product-line engineering is a specialized form of reuse that promises Productivity, Quality and shorter time to market in developing similar products in the same domain.  PLE is a streamlined integration of several aspects of software reuse. PLE embodies domain & application engineering phases that are scoped by family of products.

Product Line Engineering (PLE) - contd.  The basic technical means to create a product line include:  Domain Analysis  Software Architecture  Development Process

PLE Lifecycle: Domain analysis Architecture Development Reus. Asset Development Domain models Product Architec- ture Product Specs Reusable assets Domain Architecture Product Develop ment Product Design Product Analysis

PLE Lifecycle (contd.) Attributes of a lifecycle:  Architecture Based  Economically Driven  Reuse-driven  Domain-Specific  Process-Driven (Lifecycle is guided by Development process)

Success Factors in PLE  Domain- specific expertise.  Architectures.  Configuration management.  Business models.  Scoping the domain.  Avoid the “Least Common Denominator” concept.  Managing requirements.  Separate domain engineering unit.  Commonalities and variabilities.  AE Manual.

Product-Line Practice - PLP initiative by SEI (Software Engineering Institute) helps in facilitating and accelerating the transition to sound software engineering using a product-line approach. -The objective of the PLP initiative is to provide organizations with an integrated business and technical approach to multi-use of software assets. Strongly encouraged to acquaint your team with it and follow its prescriptions.

Essential Activities Core Asset Development-Acquisition: It is a Domain Engineering Process. Core asset activities produce or acquire the following objects: Product space: This is a description of the initial products constituting the product line.The description specifies the commonalties and the variations among the products that will Constitute the product line.

Product Line Practice Areas Software Engineering Practice Areas: Domain Analysis: domain identification, selection, scoping, modeling. Mining Existing Assets/ Applications. Developing and Evolving a Reference Architecture.

Essential Activities (contd.) Core Assets: They include an architecture that will shared by the products in the product line and reusable software components. Development and acquisition of core assets take the following inputs: Product Constraints, which deals with the kind of commonalties and variabilities that exist among the products in the family. Production Constraints, which deal with production process. Product Development Acquisition: It is an Application Engineering Process.

Product Line Practice Areas Software Engineering Practice Areas: Domain Analysis: domain identification, selection, scoping, modeling. Mining Existing Assets/ Applications. Developing and Evolving a Reference Architecture.

Product Line Practice Areas Technical Management Practice Area Metrics collection and Tracking. Product Line Scoping. Organizational Management Practice Area Organizational Structure

Product Line Methodologies Support/ Guide in the development and Evolution of the Product Line Synthesis FAST FODA JODA DADP DSSA ODM