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Requirements and Software Development

Requirements and Software Development. Charles Calkins Principal Software Engineer Object Computing, Inc. calkinsc@ociweb.com. OCI’s Business Model. Training Offer over 60 1- to 4-day classes OO design, languages, middleware, web tech SETT, Middleware News Brief articles

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Requirements and Software Development

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  1. Requirements andSoftware Development Charles Calkins Principal Software Engineer Object Computing, Inc. calkinsc@ociweb.com

  2. OCI’s Business Model • Training • Offer over 60 1- to 4-day classes • OO design, languages, middleware, web tech • SETT, Middleware News Brief articles • Custom software development • Build proprietary applications for customers • What I do • Support of Open Source software • TAO, OpenDDS, QuickFIX/FAST, Boost, etc.

  3. What I Do • Have written training articles • http://www.ociweb.com/mnb • http://www.ociweb.com/sett • Flowlink project for Teledyne Isco • Windows-based interface to water management sensors • ~700,000 lines of C++/C# • http://www.isco.com/products/products3.asp?PL=2024010

  4. 2150 and Signature

  5. Flowlink

  6. Requirements Development • Nearly daily phone calls to discuss • Lincoln, NE over 400 miles from St. Louis, MO • Isco must balance customer desires, internal product direction, what is implementable in time • Compose a Software Requirements Specification (SRS) with initial requirements • Document based on IEEE standard • http://www.csc.villanova.edu/~tway/courses/csc4181/s2010/srs_template-1.doc • Schedule proposed based on SRS • Month or more of testing included

  7. Requirements Sections • Introduction • Overall Description • operating environment, dependencies • External Interface Requirements • user, hardware, software, communications • System Features • Other Nonfunctional Requirements • performance, safety, security

  8. Be Agile… • Tech prototypes for various features • Can drive requirements, to show what is possible • No formal design document • Process docs, such as module connection • Small development team • 1 to 4 developers at OCI, project management/testing at Isco • No longer offshore development

  9. …Be Agile… • Constant feedback during development • Frequent conference calls • Code in Subversion so can be built by Isco any time • Not just a code delivery at the end of the project • Live demos via screen sharing using Teamviewer • http://www.teamviewer.com

  10. …Be Agile… • Requirements added during the project • Requests via conference call, or ticket filed via Request Tracker • http://www.bestpractical.com/rt/ • RT used for bug tracking, too • Good to have written, prioritized requests, and once implemented/fixed ticket can be resolved • Post ChangeLog info to ticket to track with codebase • Balanced against schedule, may be “negotiated” to something simpler based on time constraints

  11. …Be Agile • Changes even made during testing phase • Want stable code to test against, but stakeholders don’t always know what they want until they see something running • Automated tests help, but UI requires human testing, too • “Does this graph look correct?” • Testers and customer support can even request changes • Very flexible when everyone is a stakeholder

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