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Efficient Software Development Model for Component Reuse

This model outlines the step-by-step process for reusing external software components efficiently. It covers assessing impacts, maintenance, and development considerations. It also discusses participation, formal vs. informal approaches, user involvement, and transitioning between R&D and product development. Observations on existing meetings and a suggested model for development projects are included.

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Efficient Software Development Model for Component Reuse

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  1. Model for reuse of “external software” • Firstly we try to understand what we need • Then we look for existing components we can reuse • HEP libraries, commercial libraries • We assess impact of new component on our GAUDI architecture • inter-working with existing components • We assess impact on long-term maintenance • support, financial cost, risks etc. • Only if we don’t find anything suitable available do we develop the piece ourselves

  2. Participation in development of new software • R&D • informal approach appropriate - explore, prototype - quick & dirty • our role is to follow progress and give suggestions • need good visibility • meetings for information exchange • can be unlimited participation in this meetings • Product development • to be sure we can use product, more formal approach required • as users we are part of project with a formal role to play • users express needs in written form e.g. requirements and use-cases • total visibility - follow all important decisions • formal project meetings with limited participation • Transition between R&D and Product development needs to be handled at the right moment…..not too late

  3. Observations on Existing Meetings • Work well as a forum for information exchange • Discussion often throws up different points of view • Not clear how this input is used in planning work programme • LHCb not always well-prepared and correctly represented to take part in crucial decisions • Can be potential dangers • some idea or suggestion is picked up and acted upon without thorough discussion • mechanism for setting priorities unclear • decisions based on incomplete and imprecise information

  4. A Possible Model for Development Projects • scope of each project specific to one component • e.g. histogramming, espresso, particle properties • each component should conform to a baseline architecture as set out by the system architect • participation of project team members : typical roles to be filled include • project leader • developers • users e.g. 1 per experiment • architect, librarian, documentation manager, test manager • team discusses and agrees on tasks, priorities and responsibilities • publish everything (project plan etc) on web • frequent project meetings for project team only e.g. weekly in dev phase • brief status reports at less frequent information meetings e.g. monthly

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