1 / 8

IS estimating issues

IS estimating issues. Unique projects with much innovation “Estimates” often produced early – before specification agreed No professional estimators Few published metrics available. Analogy method. Find a similar project: Type of business Size of applications Scope of systems

baakir
Download Presentation

IS estimating issues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. IS estimating issues • Unique projects with much innovation • “Estimates” often produced early – before specification agreed • No professional estimators • Few published metrics available

  2. Analogy method • Find a similar project: • Type of business • Size of applications • Scope of systems • Technical methods and standards • Must adjust for: • Organisational culture • Users’ level of computer literacy • Degree of management support for project

  3. Analysis and programming approaches • Explicitly estimate for one stage: • Analysis method – analysis stage • Programming method – code/unit test stage • Extrapolate whole project outcome from stage estimate • Must adjust for: • Project size • Familiarity with business and technical environment • Technical complexity

  4. Direct estimate (from project breakdown) • Break down project (either using WBS or PBS approach) • Estimate for each task / product • Sum products to get stages • Sum stages to get project • Takes time… • …and requires expert estimators

  5. Delphi technique • Several estimators given specification of work and asked for estimates • Summarised anonymously and results circulated to estimators • Can revise estimates in the light of others’ ideas • Method reduces personal disagreements and ego-based issues

  6. CoCoMo • Formulae based on thousands of delivered source instructions (KDSI) • Basic, intermediate and detailed versions • CoCoMo II now developed for wider range of development approaches • Useful elapsed time formula: 2.5 x (estimated effort in man-months)0.33

  7. Function point analysis • Based on analysis of inputs, outputs and files accessed in system • Starts with unadjusted function points • Then adjusts for: • technical complexity • performance-influencing factors • risks

  8. Supporting activities • Can considerably inflate base estimates • Includes: • Proportional activities: • Team leading/supervision • Documentation • Quality control • Customer reviews • Elapsed-time activities: • Project management • Systems management • Configuration management • Project office work

More Related