Advanced Computing Tools for Applied Research Chapter 1. Introduction to software engineering

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1 Advanced Computing Tools for Applied Research Chapter 1. Introduction to software engineering Jaime Boal Martín-Larrauri Rafael Palacios Hielscher Academic year 2014/2015

2 1 Introduction 2

3 Types of software developers Many people write programs Amateur Business people Spreadsheets Scientists and engineers Simulation and data analysis tools Hobbyists Professional Application suites (productivity software, graphic design, IDEs ) Mobile and web app developers Video game developers What are the fundamental differences between amateur and professional software? 3

4 Amateur vs. professional software development Number of developers Number of end-users Documentation Amateur software Single (or a very reduced group) Very limited Optional (though recommended) Professional software Team Many (potentially millions) Essential Software is more than code Program design documentation, user guides Software engineering intends to support professional software development What kind of software should you be developing? Why? 4

5 What makes good software? 5

6 Types of applied research applications Industrial Embedded, real-time, safety-critical E.g. Data collection and control systems Interactive transaction-based Databases, distributed access, communications, HMI E.g. Web applications Scientific and technical Simulation, optimization, planning E.g. Modeling tools You typically need to combine elements from all of them 6

7 Spiral software development 1. Specification & Design 2. Implementation Releases (Alpha, Beta, RC, RTM) 4. Analysis & Evolution 3. Testing & Validation 7

8 2 System modeling 8

9 Unified Modeling Language (UML) Start coding right away is a bad idea In the long run you need to rewrite most of it DESIGN BEFORE CODING! UML is a set of universally standard diagram types to model software systems from different perspectives These diagrams are used throughout the development process Facilitate discussion during requirements elicitation A detailed description makes implementation easier Technical documentation when the project is over They need to be kept up-to-date! 9

10 UML diagrams Structure diagrams Behavior diagrams Class diagram Object diagram Package diagram Composite structure diagram Component diagram Deployment diagram Profile diagram Use case diagram Activity diagram State machine diagram Interaction diagram Sequence diagram Communication diagram Timing diagram Interaction overview diagram Check for details 10

11 Structure diagrams Class diagram 11

12 Behavior diagrams Use case diagram 12

13 Behavior diagrams Activity diagram 13

14 Behavior diagrams State machine diagram 14

15 Behavior diagrams Sequence diagram 15

16 Some UML tools Browser Desktop 16

17 Takeaways Software is much more than code Remember what makes good software Software development should be incremental Not all applications are the same Always bear in mind your particular requirements Modeling your tool before you start coding is worth the effort Prevents misunderstandings of the specification Improves communication within the development team 17

What is the Cloud? Computer Basics Web Apps and the Cloud. Page 1

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