Software Engineering

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Software Engineering

key challenges

need to continue maintaining for years

need for interface w other SW systems

customer-supplier business model (lack of info., trustworthiness, cooperation

limited possibility to detect defects

high logical complexity

heterogeneity, delivery and trust

attributes of good SW

transition properties

interoperability

reusability

portability

revision properties

testability

flexibility

operation properties

usability

integrity

reliability

correctness

acceptability

efficiency

dependability

maintainability

CASE

lower-CASE: to support later activites (programming, debugging and testing)

upper-CASE: to support the earl process activites of requirement and design

costs of SWE

distribution of costs depends on the development model that is used

costs vary depening on

requirement of sys attributes

type of sys being developed

60% of costs: development costs. 40%: testing costs

SW process

generic activities

evolution

validation

development

specification

set of activites whose goal is the development or evolution of SW

SWE and systen engineering

SysE: concerned w all aspects of computer-based systems development (HW,SW, process eng.). SWE: is part of this process concerned w developing the SW infrastructure, control, applications and DB in the system

SWE and CS

CS theories are still insufficient to act as complete underpinning for SWE

CS: concerned with theory and fundamentals. SWE: concerned with the practicalities of developing and delivering a useful sw

what is SWE?

an engineering discipline that is concerned with all aspects of SW production

SW costs

SWE is concerned w cost-effective SW development

SW costs more to maintain as it does to develop

often dominate computer system costs

what is a software?

software products

bespoke (custom)

generic

computer program and associated documentation