IS 421 Information Systems Analysis James Nowotarski 11 November 2002

Recap data flow diagramming Understand what will be on final exam Discuss Assignment 5 Discuss Quiz 3 Today’s Objectives

Course Map Contents 1. Introduction Planning Phase 2. Project Initiation 3. Project Management Analysis Phase 4. Systems Analysis 5. Gathering Information 6. Process Modeling 7. Data Modeling Assignments Quizzes Final Week Core Exam Review

Topic Duration Quiz 3 Recap15 minutes Work Planning Recap30 minutes Assignment 5 Recap30 minutes *** Break15 minutes Analysis Phase Wrap-up30 minutes Final Exam Study Guide15 minutes Sample problemsremainder Today’s agenda

Topic Duration Quiz 3 Recap15 minutes Work Planning Recap30 minutes Assignment 5 Recap30 minutes *** Break15 minutes Analysis Phase Wrap-up30 minutes Final Exam Study Guide15 minutes Sample problemsremainder Today’s agenda

Quiz 3 Problem 6 Context

Quiz 3 Problem 6

Topic Duration Quiz 3 Recap15 minutes Work Planning Recap30 minutes Assignment 5 Recap30 minutes *** Break15 minutes Analysis Phase Wrap-up30 minutes Final Exam Study Guide15 minutes Sample problemsremainder Today’s agenda

Create the work plan Users requirements 1 Negotiate reqts negotiated requirements 2 Decom- pose work breakdown structure 4 Estimate resources workmonths 3 Estimate size deliverable size 5 Develop schedule Iterate as necessary

Estimating a Project Based on Industry Information Planning Analysis Design Implementation Industry Standard For Web15% 20% 35% 30% Applications Time Required in Person Months

Management Challenges in Analysis Political difficulties –Especially in larger projects, where the new system will serve several, possibly conflicting, interest groups Communication problems –People of different backgrounds, vocabularies being asked to work together –Users in particular may struggle to understand the technical-looking outputs of the Analysis phase Scope management Analysis paralysis –Easy to become mired in detail, not know when to finish “Prematurely physical”

Project Management (50K foot view) Create Work plan Staff the project Control project work

Estimating Schedule Time Rule of thumb for estimation Schedule Time (months) = 3.0 * person-months 1/3 Source: Boehm, B. Software Engineering Economics

Timeboxing Fixed deadline Reduced functionality, if necessary Fewer “finishing touches”

Margins of Error in Cost and Time Estimates Typical margins of Error for Well-done Estimates PhaseDeliverableCost (%)time (%) PlanningSystem Request40060 Project Plan10025 AnalysisSystem Proposal5015 DesignSystem Specification2510 Source: Boehm et al. (1995)

Relative Cost to Fix an Error It costs 50x more to fix an error discovered in production than in Analysis phase Phase in which error detected AnalysisDesignCodeUnit testAcceptance test Production Relative cost to fix

Tracking Tasks Using Gantt Chart Action Week

CASE Tools Initiation Analysis Design Implementation Upper CASELower CASE Integrated CASE (I-CASE)

Procedural Metadata Logic DiagramsScreen Designs CASE Repository CASE Components

Classic Mistakes Overly optimistic schedule Failing to monitor schedule Failing to update schedule Adding people to a late project Scope creep Lack of change control

Topic Duration Quiz 3 Recap15 minutes Work Planning Recap30 minutes Assignment 5 Recap30 minutes *** Break15 minutes Analysis Phase Wrap-up30 minutes Final Exam Study Guide15 minutes Sample problemsremainder Today’s agenda

Topic Duration Quiz 3 Recap15 minutes Work Planning Recap30 minutes Assignment 5 Recap30 minutes *** Break15 minutes Analysis Phase Wrap-up30 minutes Final Exam Study Guide15 minutes Sample problemsremainder Today’s agenda

Analysis Phase From Planning Phase: System request Feasibility analysis Workplan. Dev Analysis Plan Examine- As-is Identify Improve- ments Develop Basic System Concepts Develop Data Model Develop Process Model Prepare Proposal System Walkthrough To Design Phase: Deliverables: Analysis PlanFunctional Requirements Quality Requirements System Concept Data Model Process Model System Proposal

Analysis Phase From Planning Phase: System request Feasibility analysis Workplan. Dev Analysis Plan Examine- As-is Identify Improve- ments Develop Basic System Concepts Develop Data Model Develop Process Model Prepare Proposal To Design Phase: Deliverables: Analysis PlanFunctional Requirements Quality Requirements System Concept Data Model Process Model System Proposal Develop Concept for To-Be System

Staffing Considerations #1 success factor Right skills at the right time Best to have a functional orientation Architecture work will likely begin in parallel Need people who are multidisciplinary No substitute for experience

Topic Duration Quiz 3 Recap15 minutes Work Planning Recap30 minutes Assignment 5 Recap30 minutes *** Break15 minutes Analysis Phase Wrap-up30 minutes Final Exam Study Guide15 minutes Sample problemsremainder Today’s agenda

Topic Duration Quiz 3 Recap15 minutes Work Planning Recap30 minutes Assignment 5 Recap30 minutes *** Break15 minutes Analysis Phase Wrap-up30 minutes Final Exam Study Guide15 minutes Sample problemsremainder Today’s agenda

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