Software Development!

Software Development!

1. TELOS

   • Technical
     • Technical Feasibility:
       • Does the technology exist to do what we want to do?
   • Economical
     • Economical Feasibility:
       • Will it make sense from a financial point of view to develop this software? For example, if it costs more than we'll save over the next 7 years it might not be worth doing.
   • Legal
     • Legal Feasibility:
       • Are there any copyright issues that might stop us going ahead? For example, infringing the patents of another company to bring out a competing profdcut may result in that product having to be withdrawn or compensation being paid.
   • Operational
     • Operational Feasibility
       • Will the users be able to operate it? Will it be practical to use or will people just not bother?
   • Schedule
     • Schedule Feasibility
       • Is it possible to develop this software in the necessary timescale? When does ithe company need it by? A phone app for the 2012 Olympics needed to be ready before it started!

2. The Waterfall Model

   • Feasibility Study
   • Analyse
   • Design
   • Implement
   • Evaluate
   • Maintain
   • Advantages
     • Steps are easy to maintain
     • Defined processes and output per step
     • Good model for managing large groups of developers working in parallel
   • Disadvantages
     • Requirement changes mean going back to an earlier stage that had already been completed
     • Changes can be costly in money and time
     • Lack of customer involvement after "ANALYSIS" means issues are not highlighted until the "EVALUATION".

3. The Cyclical Model