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Agile Architecture and Design

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Agile Architecture and Design

  1. 1. P K Mallik Architecture, Design, Value Delivery and Grooming Agile Architecture and Design
  2. 2. P K Mallik Source : Agile Modelling in Software Engineering by Audrey Nemeth and Vladimir Borisov Feature Driven Development RFI/RFP/ Proposal Business Case Change Requests Other Costs Refresh Change Requests Defects
  3. 3. P K Mallik Agile Requirements/Features Mapping Features User Story – Checkout Check Out items Pay by Credit Card Send Email Confirmation As a user I should be able to pay for purchased items so that I can place the order Notes: • Payment by multiple credit cards • Email to be sent with purchase details Acceptance Criteria: • Purchase to be retained even when cancelled Cancelled purchases to be recorded Order Fulfilment Epic – Fulfilment On successful purchase goods purchased will be dispatched within 48 hours Theme – Security Password policy and role based access control as well as maker- checker must be supported System must adhere to companies security policies
  4. 4. P K Mallik Features User Story Security Performance Usability Others RBAC Data Filter Capacity Latency UI Preferences Menu Feature 1 User Story 1 X X X X X X User Story 2 X User Story 3 X X X X X Feature 2 User Story 4 X X Feature 3 User Story 5 X X X User Story 6 X X X User Story 7 X X X X Feature 4 User Story 8 X X User Story 9 X X X User Story 10 X X X X Feature 5 User Story 11 User Story 12 X X X X Implementation approach Template Component Service Optimise Db Template Template Template Implemented by Story Story Story Activity Story Story Story Agile Mapping
  5. 5. P K Mallik Managing Features and Themes • Each Feature can map to more than one user story, however each user story can map to only one feature (If this is not the case there is something wrong in your definitions) • Themes that are implemented as user stories will be scheduled independently – To minimize impact of stories already delivered • Define placeholders in templates which will implement the theme • OR Create stubs which are called by components of affected user stories • DO NOT design assuming that thee components will be revisited when the theme is implemented • Test plan for Theme will need to verify implementation across all impacted user stories that have been developed – To ensure implementation in stories which will be delivered • Verify that theme is implemented in template • OR inspect code of component to ensure theme implementation • Test plan to include verification for theme implementation • Themes that are implemented as activities should be scheduled as part of the activities for the foundation and hardening sprint
  6. 6. P K Mallik Agile Framework Pre-sales Epics Effort Estimate Contract Estimates Sizing RFP Scope Story Points Milestone Dates Delivery – Foundation Architecture Requirement Foundation Management Foundation Solution Foundation ReleasePlan Delivery – Development and Testing DetailedDesign/FnSpec Delivery – Acceptance UAT Iteration Plan Coding and UT Module Integration Testing Task Assignment HLD Templates Standards Common Components Entities Attributes and Relations Code Configuration NFR Testing Walkthrough Production Feature Sizing Acceptance Test Plan
  7. 7. P K Mallik Functional Non-Functional Evolutionary Design Pre Sales (Contract) Application Architecture Features Themes Story/Function Points Non Functional Requirements Functionality Concepts, Standards and Templates Estimate, Staffing Principles, Components and Interfaces Velocity, Productivity, Buffers, Activities Foundation (Plan) High Level Design Epics Themes Project Backlog Story Points Sprint (Actual) Low Level Design User StoriesBacklog Story Points Tasks Estimate, Staffing Velocity, Activities Actual Dis Assembly Estimate Velocity Assign
  8. 8. P K Mallik Application Architecture Data Layer Business Layer ERP CRM Workflow External Interfaces BPM Web Services User Interface Layer Cloud Mobile Tablet Web Db Server OLAP Db Content Server
  9. 9. P K Mallik Agile Architecture Data Layer Business Layer Db Server OLAP Db Content Server User Interface Layer Usability Themes User Story 1 User Story 2 Maintainability Themes Performance Themes Task1Task2 Task1Task2Task3 Security ThemesEpic User Story 3 Availability Themes QueryMemory/CPURendering AuthenticationAccessControlDataFilter
  10. 10. P K Mallik High Level Design High Level Requirement User Story Architecture High Level Design Conversation Entities • Keys • Attributes • Relations • CRUD Forms • Short Description • Key Fields • Special Navigation • Business Rules Reports • Short Description • Reporting Logic • Key Fields • Important Formulae Components • Short Description • Important Methods and Attributes • Business Rules • Threading, Static, Async Templates • Short Description • Business Rules • Themes • Public Methods and Attributes • Virtual Methods and Attributes Themes Constraints Acceptance Criteria Use CaseFDD RDD Notes Validate
  11. 11. P K Mallik High Level Design – Checkout Form Template Check Out Form • Items Grid View • Prices and Taxes • Credit Card Fields • Payment Button Confirmation Form • Items Grid View • Receipt Fields • Print and Save Component Template Invoicing • Generate Invoice() • Calculate Charges() Interface Template Payment Gateway • Payment Request () • On Success Save() • On Failure Cache() Report Template Invoice Print • Amount to Words() • Print() • Save As PDF() Database Invoice header • Date, Number, Client • Invoice Detail • Charges • Items Client • Points Balance
  12. 12. P K Mallik Low Level Design High Level Design Entities • Keys • Attributes • Relations • CRUD Forms • Short Description • Key Fields • Special Navigation • Business Rules Reports • Short Description • Reporting Logic • Key Fields • Important Computations Components • Short Description • Important Methods and Attributes • Business Rules • Threading, Static, Async Templates • Short Description • Business Rules • Themes • Public Methods and Attributes • Virtual Methods and Attributes Low Level Design Entities • Foreign Keys • Column Type and Length • Constraints • Triggers Forms • Wireframe • Navigation • Field level validations • Messaging • Form Actions Reports • Parameters • Data query logic • Layout • Summaries • Drill downs Components • Public attributes • Events • Methods • Service Management Templates • Methods • Attributes • Facades • Overwritten attributes and methods • Test scenarios
  13. 13. P K Mallik Example – Shopping Cart Epic – Registered user searches for products for Purchase User Stories Search Select CheckoutLogin High Level Design Search Form • Free Text Search • Product Name, Category, Size, Colour and brand Query Generator • Create Query based on selected parameters • Fetch Data Saved Searches • Parameter • Value Low Level Design Wireframe Field Validations Query Generator Interface Save Searches Retrieve Searches Pre Sales Release Planning Release Foundation Sprint
  14. 14. P K Mallik Agile Techniques
  15. 15. P K Mallik Agile Delivery Model Business Case Application Release Sprint Factory Acceptance User Acceptance System Integration Deployment ValueRealisation Functional Tactical Strategic Business
  16. 16. P K Mallik Agile Coverage Level 0 – Start up Level 1 – Basic Level 2 – Advanced Level 3 – Enterprise BusinessFunctionalTacticalStrategic BusinessValue
  17. 17. P K Mallik Offshore Onsite Onsite Project Life Cycle Scope (Epics/Themes) Solution Architecture Release Plan Iteration Plan Low Level Design Code Unit Testing Module Integration Testing NFR Testing Acceptance Test Plan Factory Acceptance Testing System integration Testing User Stories Release Backlog Requirements Overview Sizing and Effort Release Iteration Application/Product Standards and Templates Prototypes Key Component Configuration NFR TestingUAT UAT SA Product Owner Developer Tester Project Manager TA BA Enterprise Architecture High Level Requirements Detailed Requirements Governance Model HLD
  18. 18. P K Mallik Roles and Responsibilities Pre-sales Foundation Delivery Solution Architect Technical Architect Define Scope Identify Technologies Define Architecture Estimate costs and Schedule Prototyping Select Technologies Identify Interfaces Define implementation strategy Define NFR Approach POC’s for NFR’s High Level Design Define Templates Identify Key Components Assist in Test Plan, Project Plan, Estimation Product Configuration Tool Setup Standards and Templates Assist in Design, NFR Test Planning, Estimation Grooming Capability Building Troubleshooting Change Controls Grooming Capability Building Troubleshooting Complex Component Development
  19. 19. P K Mallik Thank You

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