Estimation and measuring of software size within the atos gobal delivery platform gerd peters
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The document discusses Atos' use of functional point analysis (FPA) for software estimation within its Global Delivery Platform (GDP). It describes how Atos uses FPA to estimate project size, calculate standard effort, and convert effort into cost. FPA is integrated into GDP's processes and phases to enable estimation of main build effort and full lifecycle effort. Historical FPA data collected within GDP is used to determine productivity ratios for estimation.
![7
19/10/2015
Function Points in GDP
For external use
Atos Global Delivery Platform
General Description
▶ Software estimation process is part of the global quality management system Atos Global
Delivery Platform [GDP].
▶ GDP is a set of processes, standards and control tools in conjunction with a process
supporting the software manufacturing.](https://image.slidesharecdn.com/estimationandmeasuringofsoftwaresizewithintheatosgobaldeliveryplatform-gerdpeters-151021054816-lva1-app6892/85/Estimation-and-measuring-of-software-size-within-the-atos-gobal-delivery-platform-gerd-peters-7-320.jpg)
![18
19/10/2015
Function Points in GDP
For external use
Atos Global Delivery Platform
General Description
▶ Software estimation process is part of the global quality management system Atos Global
Delivery Platform [GDP].
▶ GDP is a set of processes, standards and control tools in conjunction with a process
supporting the software manufacturing.](https://image.slidesharecdn.com/estimationandmeasuringofsoftwaresizewithintheatosgobaldeliveryplatform-gerdpeters-151021054816-lva1-app6892/85/Estimation-and-measuring-of-software-size-within-the-atos-gobal-delivery-platform-gerd-peters-18-320.jpg)
Estimation and measuring of software size within the atos gobal delivery platform gerd peters
- 1. 19/10/2015 Best practises and standards for estimation and measuring of software size within the Atos Gobal Delivery Platform Atos Team Gerd Peters, Janusz Marcinkowski, Janusz Charczuk, Karol Nowosielski
- 2. 2 19/10/2015 Function Points in GDP For external useAgenda • Atos is … • For what purpose Atos uses Functional Points? • Functional Points support from Atos Global Delivery Platform • Experiences and conclusions
- 3. 3 19/10/2015 Function Points in GDP For external use ▶ The Atos Story – delivering the Global Experience ▶ Over 20 years relationship with the International Olympic Committee ▶ Turning the Games into a fully connected global experience ▶ Bringing together people, process and technology ▶ Embracing digital transformation through the use of disruptive technologies 3
- 4. 4 19/10/2015 Function Points in GDP For external use Atos is … Global Digital Services Leader that powers progress for the firms of the future by uniting people, business and technology. € 9,051 bn 2014 revenue~93,000 headcount 66 countries
- 5. 5 19/10/2015 Function Points in GDP For external use Atos, a global player
- 6. 6 19/10/2015 Function Points in GDP For external use Atos addressing the Digital Transformation along the whole value chain Big Data: transforming data into customer tangible business value Customer usage DATA MODELLING MASSIVE DATA REAL-TIME DATA COMPLEX ANALYTICS IoT DATA AGILE DATA Consulting Business App integration Finance Telco & OTT Retail Healthcare Energy Aerospace Automotive Weather Research Medias Defence… IT Platforms & appliances High Power Computing In memory Open commute Delivery & Operations MANAGED SERVICES IaaS/SaaS
- 7. 7 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform General Description ▶ Software estimation process is part of the global quality management system Atos Global Delivery Platform [GDP]. ▶ GDP is a set of processes, standards and control tools in conjunction with a process supporting the software manufacturing.
- 8. 8 19/10/2015 Function Points in GDP For external use Atos has used FP for many years ▶ Sizing methods: IPPUG, COSMIC, NESMA, UoW, … ▶ Sizing objects: constantly expanded Estimation Service Catalogues ▶ Sizing metrics: IT Service metrics depend on FP have been collected since 2008 ▶ More than 1500 measurements from over 200 projects ▶ Statistics from over a dozen key technologies ▶ Statistics from over a dozen variants of nature of the projets 3GL 4GL Cobol EAI Tibco Java Microsoft .Net Oracle …. New development Enhancement Migration ….
- 9. 9 19/10/2015 Function Points in GDP For external use ATOS USES FUNCTION POINTS METHOD For what purpose?
- 10. 10 19/10/2015 Function Points in GDP For external use Dilemmas during estimation Customer Supplier 1. Number of FP 2. Workload of the project 3. Risks 4. Activity unmeasurable in FP 5. Total project cost 6. FP rate 1. Really needed functionalities 2. Minimum of TOC 3. Total FP 4. FP rate 5. Risks 6. Supplier activity unmeasurable in FP
- 11. 11 19/10/2015 Function Points in GDP For external use Quantifying customer requirements - Sizing Converting product size into standard effort Applying adjustments Converting effort into cost Sizing methods: FP (IFPUG), COSMIC, UoW, LoC, TC … Standard productivity published on Service catalogue. System Characteristics (IFPUG) + context/tech adjustments Cost rates (Service Cat), FO/BO distribution (bid decision) 1 2 3 4 Principles of estimation * The productivity rates may depend on the technology, tools, processes as well as skill and experience of the resources. The productivity rates are arrived from the historical data in organization database.
- 12. 12 19/10/2015 Function Points in GDP For external use 1. Estimation is an approximation, not a project plan. 2. We don’t know and can’t control all factors that affects productivity but we can mitigate the risks using history. 3. Analyze the data to identify patterns, strengths, weaknesses. Key points during estimation Estimations Risk Mitigation Methods: • Use a size and a productivity ranges: the worst, the best and the most likely. • Incorporate size growth into the baseline estimation (x%): normally projects are more complex that they seem to be at a very early stage. • Increase the main drivers: schedule or effort. Increase of staff has limited effectiveness and is costly.
- 13. 13 19/10/2015 Function Points in GDP For external use FPA method FP Lifecycle in Atos 1. FP estimation of application size 2. Main-build estimation 3. Dependent metrics calculation 4. Project plan/re-plan 5. Progress of the project, used resources, earned deliverables monitoring 6. Atos’s knowledge base updating
- 14. 14 19/10/2015 Function Points in GDP For external use FPA method Information flows Historical information Track & Forecast Benchmark & Analyze Estimate & Plan
- 15. 15 19/10/2015 Function Points in GDP For external use We use three types of counts to be distinguished: Indicative count +/- 50% (mostly performed during the RFI phase); Rough count +/- 20% (RFP, a quick estimate made from data models with some assumptions, e.g., medium complexity); Detailed count +/- 5% (RFP, clean order, consumes more time to count). A Detailed count should be done using IFPUG version provided in the Estimation Techniques/IFPUG’ folder. • Experience shows that a detailed count does not add much to the accuracy of the count but it is much extra effort to do compared to a rough count. • Recommendation is to stick to rough counts, as the uncertainty of this count after delivery is +/- 10%. The 20% in earlier phases is 10% higher due to uncertainties in the specifications A Rough count is a count in which all FPA functions are identified conform the IFPUG guidelines but are classified as average for the functions (EI, EO, EQ) and simple for the logical files (ILF and EIF). An Indicative count is a quick estimate made from the data model, based solely on the present logical files (ILFs and EIFs) and, assuming that there will be about three EIs (to add, change, and delete information in the ILF), two EOs, and one EQ on average for every ILF, and about one EO and one EQ for every EIF. FPA method Types of measurements
- 16. 16 19/10/2015 Function Points in GDP For external use Quantitative Software Metrics (QSM) SLIM Estimate tool uses the following parameters to estimate the effort needed: • Effective Lines of Code (Elocs) • Man Month • Elapsed Time • PI - Productivity Index (measures Team efficiency) • MBI - Manpower Buildup Index (measures Time Pressure) Productivity in Hrs/FP Productivity measure (hours/FP) is not linear in software development: Development is not Manufacturing. When time span is decreased, the hours/FP increase FPA method QSM SLIM tools
- 17. 17 19/10/2015 Function Points in GDP For external use ATOS GLOBAL DELIVERY PLATFORM Functional Points support from
- 18. 18 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform General Description ▶ Software estimation process is part of the global quality management system Atos Global Delivery Platform [GDP]. ▶ GDP is a set of processes, standards and control tools in conjunction with a process supporting the software manufacturing.
- 19. 19 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform S5 - Estimation Management ▶ S5 Estimation Management process is defined within GDP. It is an integral part of activities whose goal is the planning of software deliveries according to the binding schedule, within the foreseen budget and applying the due diligence.
- 20. 20 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform Integrated Software Delivery ▶ Atos Global Delivery Platform E0-E4 engineering processes enable Atos Integrated Software Development Process encompassing L1-L11 phases, which form the complete software manufacturing cycle.
- 21. 21 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform Rough/detailed estimation after Req Dev ▶ The amount of functional points, relevant to the considered functional area of application, is calculated through activities of GDP L2 Requirements Development phase. `
- 22. 22 19/10/2015 Function Points in GDP For external use FPA method Productivity ratio Requirement assessment and detailed technical design Build and unit test Integration System testing Documentation preparation L4 L5 L6 L7 L8 Construction and development of software GDP phases DCUT (design, Construct and Unit Test) Main Build effort Function Points : functionality delivered ▶ Productivity is the measure of an effort invested vs. output ▶ Productivity is obtained by measuring the number of hours needed to execute one FP by a certain team
- 23. 23 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform Main Build & Full Lifecycle estimation ▶ The estimation of the workload necessary for manufacturing of the software presenting the required quality levels is done on the basis of estimations performed during L2 phase coupled with an analysis of available past data addressing the productivity of the considered technology. Above values are example values chosen for presentation purposes only
- 24. 24 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform Main Build & Full Lifecycle estimation ▶ The phases from L4 up to L8, defined as „main build”, are distinguished within GDP AISD through percentage parameters, which define the share of each phase in the total software manufacturing workload.
- 25. 25 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform Main Build & Full Lifecycle estimation ▶ The GDP methodology allows the estimation of the total workload of the global software manufacturing process (including the final transition into production) on the base of the ratio of workload regarding L1-L11 phases to the workload regarding L4-L8 phases.
- 26. 26 19/10/2015 Function Points in GDP For external use FPA method FP dependent metrics calculation FP complexity Main-build effort Non-Main Build effort Adjustment factors Project Teams calculation Main Build covers activities: • L4 Requirement assessment + Detailed technical design • L5 Build + Unit Tests • L6 Integration • L7 System Testing • installation manual in L8 Documentation preparation • related Management and support tasks
- 27. 27 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform S3-Measurement Management
- 28. 28 19/10/2015 Function Points in GDP For external use Atos Global Delivery Platform S3-Measurement Management ▶ After the completion of L8 phase, the actual workload (i.e. the workload used in the real software manufacturing process) is reported. ▶ Additionally are generated statistics regarding the amount of defects detected during the performed quality verifications. ▶ The measures performed within S3 process are then processed by Atos Global Metrics Office in order to update the global productivity database with regard to the technology used in the creation of the considered system. ▶ The obtained statistics help to perform more accurate workload estimations of the subsequent projects delivered according to the Atos Global Delivery Platform.
- 29. 29 19/10/2015 Function Points in GDP For external use EXPERIENCES & CONCLUSIONS FP Lifecycle in Atos
- 30. 30 19/10/2015 Function Points in GDP For external use • Simplification of procurement process • Focus on contracting principles • Requirements qualification • Budget prediction • Scope2Value analysis • Progress control based on standard metrics • Time to market reduction • Focus on business needs • Limited non business related waste activities • Common understanding of scope complexity • Agile change and risk management • Continuous improvement based on KPIs (quality and quantity) based on knowledge and experience reuse • Lower presales effort • Governance simplification • Resource allocation prediction • Quantitative and qualitative resource evaluation • Maintenance effort prediction • Overall cost reduction • Customer Satisfaction improvement EXPERIENCES & CONCLUSIONS Key benefits of using FP in contracts AtosCommonCustomer Using complexity metrics we have achieved in 2 years contract: ~30% time to market reduction ~20% defects reduction ~25% efficiency improvement ~35% Customer Satisfaction improvement
- 31. 19/10/2015 Thank you Atos, the Atos logo, Atos Consulting, Atos Worldline, Atos Sphere, Atos Cloud and Atos WorldGrid are registered trademarks of Atos SA. June 2011 © 2011 Atos. Confidential information owned by Atos, to be used by the recipient only. This document, or any part of it, may not be reproduced, copied, circulated and/or distributed nor quoted without prior written approval from Atos.