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planning design phase implementation phase

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15 diapositives · 370 Views · Jul 27, 2014

8 September 2010. planning design phase implementation phase. SCHEDULING. Scheduling . Put together minimal solution Start with external commitments Introduce internal milestones Focus on the risks Add next level of features where possible. Identify components Identify dependencies

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  1. 8 September 2010 planning design phase implementation phase

  2. SCHEDULING

  3. Scheduling • Put together minimal solution • Start with external commitments • Introduce internal milestones • Focus on the risks • Add next level of features where possible • Identify components • Identify dependencies • Estimate (guess) • Prefer educated guess • Lay out assignments and time frames Process Within the Steps

  4. Use simple Excel spreadsheet (or equivalent) Project Plan for this project

  5. Questions project plan answers • What is Joe working on this week? • Who can help me if I run into trouble? • If I have to choose an activity to be late, which one will impact the project more?

  6. What needs to be in the plan? • All Deliverables • Code • Design • Test • Documentation • Learning • Presentation and demo prep • Reviews

  7. Reviews and Inspections • Why? • Developer can’t correct unseen errors • More eyes to catch problems • Earlier is cheaper • Integration fix typically 3-10 times the cost at design • Difference in terms • Review implies completed work, often reviewed by someone at a different level • Inspection implies peer review of work in progress

  8. Should we eliminate risk? Patton: Take calculated risks. That is quite different from being rash. Nehru: The policy of being too cautious is the greatest risk of all. Herodotus: Great deeds are usually wrought at great risks. The Net: No risk => no challenge

  9. Risks • “80% of software projects fail” • Standish Report (1995) • 16.2% completed on-time and on-budget with all features and functions as initially specified. • 52.7% completed and operational but over-budget, over the time estimate, and offers fewer features and functions than originally specified. • 31.1% cancelled at some point during the development cycle. • Sauer et al (2007) claim 67% “delivered close to budget, schedule, and scope expectations” with experienced project managers • Two types of risk • Avoidable • Unavoidable

  10. DESIGN: ARCHITECTURE

  11. Software Architecture • What is an architecture? • External view • What does that mean for software? • The highest level design • Often treated as top level of system design • not consistent

  12. Your Architecture • First level diagram How the components fit together • Later will study well-known architectures • Examples from last year…

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