Rekayasa Perangkat Lunak Kuliah 2

Outline of this presentation Attributes of Good Software Why Software Engineering ? What is Software Product ? Software Myths 2

Attributes of Good Software Maintainability Dependability Efficiency Usability 3

Attributes of Good Software Maintainability more than 50% of software cost is due to maintenance Easy to maintain Good Documentation Good Design 4

Attributes of Good Software Dependability Reliability, Do the Right Process Security, Good Thread Protection Safety No Surprise On-line & Off-line Help 5

Attributes of Good Software Efficiency Memory, Small Memory Usage CPU time Efficient cycle time Storage Minimum Amount of Storage 6

Attributes of Good Software Usability User Interface Familiar Look Nice & Complete Incorporate Message Alert Documentation User Guide Thorough & Complete 7

Why Software Engineering ? Analogy with bridge building: Over a stream easy, one person job Over River Severn … ? (the techniques do not scale) 8

Why Software Engineering ? ...to get away from ad hoc and unpredictable software development towards a systematic, understood one… 10

What is Software Product ? a general market Software products may be developed for : or may be developed for a particular customer 11

What is Software Product ? Software products may be Generic (for general market) developed to be sold to a range of different customers e.g. Excel or Word or Power Point etc 12

What is Software Product ? Software products may be Bespoke / Custom (for particular customer) developed for a single customer according to their specification. e.g. ……….. 13

New software can be created by Developing new programs, or Reusing existing software Configuring generic software systems 14

New software can be created by Developing new programs, Starting from scratch one full development cycle 15

New software can be created by Reusing existing software Not starting from scratch Using own working software Modifying & Adapting with the New Requirement 16

New software can be created by Configuring generic software systems Not starting from scratch Using on the shelve software Tailoring with the requirement 17

Software Myths Wrong Assumption From Management Cost - Schedule - Quality Customer Use Developer Build 18

Management Myths Myth Fact Standard and procedures are already exist for producing software Fact Standards are rarely used Developers rarely know about them Standards are often out-of date and incomplete 19

Management Myths (cont.) Myth Fact State-of-the-art tool are the solution Fact A fool with a tool is still a fool 20

Management Myths (cont.) Myth If we get behind schedule, we can always add more peoples and thus catch up Fact Software development is not a mechanistic process like manufacturing. Adding people to a late software project makes it later. What about Training - Integration - Social Aspect 21

Developer Myth Myth Fact The only deliverable is the working program(s). Fact A working program is only one part of a software configuration that includes requirements and specification documents, testing information and other developmental and maintenance information. 22

Developer Myth (cont.) Myth Fact Once the program is written and it works, then the job is done. Fact Between 50 and 70 percent of all effort expended on a program will be expended after it is delivered to the customer. 23

Developer Myth (cont.) Myth Fact Until the program is running, there is no way to assess its quality. Fact One of the most effective software quality assurance mechanisms is the formal technical review and this can be applied from the inception of the project. 24

Customer Myth Myth Fact A general statement of objectives is sufficient to begin writing programs - we can fill in details later. Fact Thorough communication between customer and developer needed 25

Customer Myth (cont.) Myth Fact Changes can be easily accommodated because software is flexible Fact Changes happen as a fact of life late changes are expensive 26

Finished, Questions?

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