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CEN6070-Chapter7.1.ppt
1.
OHT 7.1 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Chapter 7.1
2.
OHT 7.2 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 • Software development methodologies: - The software development life cycle (SDLC) model - The prototyping model - The spiral model - The object-oriented model • Factors affecting intensity of SQA activities • Verification, validation and qualification • Development and quality plans for small and for internal projects • A model for SQA defect removal effectiveness and cost Chapter 7
3.
OHT 7.3 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Introduction • We will start off talking about (in some cases reviewing) popular development models • Will switch to discussion how SQA activities are handled within the development process, and • Factors that need to be considered before applying these activities… • So, why this approach?
4.
OHT 7.4 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Introduction • Why discuss the models? • Answer: They represent the framework of a disciplined approach to development. – Have milestones, deliverables, constraints, etc. • SQA must take place in conjunction with the completing of these activities or looking at the work products produced from these activities. • Need to understand the models before we can produce plans that are integrated into these models.
5.
OHT 7.5 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 1. Classic and Other Software Development Methodologies • Will discuss – The Software Development Life Cycle (SDLC) – The prototyping model – The spiral model – The OO model
6.
OHT 7.6 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The SDLC • The ‘classic mode.’ – Still in WIDE use today. – Captures the major building blocks in development – Linear sequence – Highly structured; plan-driven; Heavy-weight process – Product delivered for evaluation and deployment at the end of development and testing – Big bang approach – Used for major projects of length – But serves as a framework for other models…
7.
OHT 7.7 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Prototyping Model • Replaces some of the parts of the SDLC with an evolutionary and iterative process. • Software prototypes are repeatedly provided to customer for evaluation and feedback. – Primarily iterate design and implementation. – Development team provided requirements. • Ultimately, the product reaches a satisfactory completion. • Then, the remainder of the process is carried out in the context of another model, such as SDLC
8.
OHT 7.8 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Spiral Model • Uses an iterative approach designed to address each phases in development by obtaining customer comments and change, risk analysis, and resolution. • The spiral model typically has a ‘spiral’ for each of the traditional development phases. • Within a cycle, specific engineering (design, development, etc.) can take place using any other models, like SDLC, prototyping,.. • The Spiral Model (Barry Boehm) is a risk-centered development model where each spiral includes major risk activities / assessments. • Was developed after SDLC in response to delayed risk in SDLC • As the SDLC, it is considered a heavy-weight, plan-driven methodology and is highly structured.
9.
OHT 7.9 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The Object-Oriented Model • Emphasis here is re-usability via reusable objects and components. • Component-based software development. • For non-available components, developer may – prototype needed modules, – use an SDLC approach, – purchase libraries of objects, – develop ‘his’ own, etc.
10.
OHT 7.10 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Now, in a bit more detail…
11.
OHT 7.11 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The SDLC • Requirements Definition: done by customers • Analysis: analyze requirements to form an initial software model • Design: Detailed definition of inputs/outputs and processes including data structures, software structure, etc.
12.
OHT 7.12 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The SDLC • Coding: Design translated into code. – Coding includes SQA activities such as inspections, unit tests and integration tests – Many takeoffs from this: These tests done by developers: individual (unit), group or team (integration tests….)
13.
OHT 7.13 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The SDLC • System Tests: Goal: to discover errors / correct errors to achieve an acceptable level of quality. Carried out by developers prior to delivery. • Sometimes ‘acceptance tests’ carried out by customer or in conjunction with developer
14.
OHT 7.14 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The SDLC • Installation / Conversion: – After testing, system is installed and/or replaces an existing system; – Requires software / data conversion – Important to not interrupt daily activities during conversion process. • Install incrementally, run in parallel; turn switch and live with it, etc.
15.
OHT 7.15 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The SDLC • Operations and Maintenance: – Hopefully done for years. – Maintenance: • Corrective • Adaptive • Perfective • Lots of variations to the classic SDLC many in response to problems…. • Notice the feedback loops?
16.
OHT 7.16 Galin, SQA
from theory to implementation © Pearson Education Limited 2004
17.
OHT 7.17 Galin, SQA
from theory to implementation © Pearson Education Limited 2004
18.
OHT 7.18 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The Prototyping Model • One main idea behind prototyping is for the development of fast prototypes and customer availability for feedback. • Often prototyping tools are used to help • Developers respond to feedback and add additional parts as application evolves into an acceptable product. • Recognize this process can be inserted into the SDLC or other models.
19.
OHT 7.19 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 REQUI REMENTS DETERMI NATI ON BY CUSTOMER PROTOTYPE DESI GM PROTOTYPE I MPLEMENTATI ON SYSTEM CONVERSI ON PROTOTYPE EVALUATI ON BY CUSTOMER SYSTEM OPERATI ON AND MAI NTENANCE REQUI REMENTS FOR CORRECTI ONS, CHANGES AND ADDI TI ONS REQUI REMENTS FULFI LLED ? SYSTEM TESTS AND ACCEPTANCE TESTS NO YES A good approach for small to medium-sized projects. Very important: customer involvement.
20.
OHT 7.20 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Prototyping Model - more • Advantages (book) – Shorter development process – Substantial savings in development resources (time) – Better fit to customer requirements and reduced risk of project failure – Easier and faster user comprehension of new system • Disadvantages – Less flexibility and adaptability to changes and additions – Reduced preparation for unexpected instances of failure
21.
OHT 7.21 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The Spiral Model • A heavy-weight, plan-driven, highly- structured approach for large projects. • Especially designed for those with higher chances of failure. • Combines iterative model, emphasizes risk assessment, customer participation, prototyping, and more • Definitely an iterative process.
22.
OHT 7.22 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Source: After Boehm 1988 (© 1988 IEEE) Can see each spiral includes: Planning Risk Analysis / Resolution Engineering activities (design, code, test…) Customer Evaluation (errors, changes, new requirements…)
23.
OHT 7.23 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Source: After Boehm 1998 (© 1988 IEEE) Revised Spiral Model provides customer with improved chances for changes; developer better chances to stay within budget and time. Done by increased emphasis on customer participation and on engineering activities. Extra sections in spiral dedicated to customer actions and developer engineering
24.
OHT 7.24 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 The Object-Oriented Model • Easy integration of existing software modules (objects / components) into newly developed software systems. • Process begins with OOA and OOD • Then, acquire suitable components from reusable software component libraries (or purchase them). • Otherwise, develop as needed. • Can involve adding to repertoire of library components. • Economy: integrating reusable components; much lower cost than developing • Improved quality – using tested components • Shorter development times: integration of reusable software components.
25.
OHT 7.25 Galin, SQA
from theory to implementation © Pearson Education Limited 2004
26.
OHT 7.26 Galin, SQA
from theory to implementation © Pearson Education Limited 2004 Now, onto Factors Affecting the Intensity of Quality Assurance Activities within the Development Process…
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