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Produce a working object- oriented program which meets the design specification

Unit 23:

Designing and Developing Object-oriented Computer Programs

Unit code: T/601/3308
QCF level: 4
Credit value: 15
Guided learning hours: 90

Unit aim

The aim of this unit is to teach learners to learn how to design and develop using object-oriented programming. Use of objects simplifies the task of creating and maintaining complex applications. Object-oriented programming is a way of modelling software that maps programming code to the real world.

Competency unit assessment guidance

This unit should be assessed predominantly in the workplace. Please see Annexe E. Observation, witness testimony, questioning, professional discussion, written and product evidence are all sources of evidence which can be used.

Unit introduction

Object-oriented programming is an industry-proven method for developing reliable modular programs and is popular in software engineering and systems development. Consistent use of Object-oriented techniques can lead to shorter development life cycles, increased productivity, adaptable code, reuse of different technologies, the interaction of different systems using common platforms, and therefore lower the cost of producing and maintaining systems.

In terms of impact, Object-oriented technology can be found in many systems, from commercial operating systems to mobile phones, and in many multimedia applications. The majority of programming languages are Object-oriented in focus, with the exceptions preferring to offer specialist programming resources. It is dominant in Visual Studio, C++, Java, the Microsoft.net environment, Action Script and many other systems.

Learner undertaking this unit will have the opportunity to develop their existing programming skills from Unit 22: Designing and Developing Procedural Computer Programs, and apply them to develop their own code using the object-oriented methodology.

Learning outcomes and assessment criteria

In order to pass this unit, the evidence that the learner presents for assessment needs to demonstrate that they can meet all the learning outcomes for the unit. The assessment criteria determine the standard required to achieve the unit.

On completion of this unit a learner should:

Learning outcomes

Assessment criteria

1    Design object-oriented programs to address loosely-defined problems

1.1    Identify a set of classes and their interrelationships to address the problem

1.2    Make effective use of encapsulation, inheritance and polymorphism

1.3    Select and reuse pre-existing objects and templates specialising as required

1.4    Structure the design so that objects communicate efficiently

1.5    Specify the properties and behaviour of classes to allow efficient implementation, selecting appropriate data types, data and file structures and algorithms

1.6    Record the design using well- established notations

2    Produce a working object- oriented program which meets the design specification

2.1    Make effective use of basic programming language features and programming concepts to implement a program that satisfies the design specification

2.2    Make effective use of the features of the programming environment

2.3    Make effective use of user interface components in the implementation of the program

2.4    Make effective use of a range of debugging tools

3    Develop object-oriented programs that reflect established programming and software engineering practice

3.1    Apply standard naming, layout and comment conventions

3.2    Apply appropriate data validation and error handling techniques


Learning outcomes

Assessment criteria

4    Develop test strategies and apply these to object-oriented programs

4.1    Develop and apply a test strategy consistent with the design identifying appropriate test data

4.2    Apply regression testing consistent with the test strategy

4.3    Use appropriate tools to estimate the performance of the program

5    Develop design documentation for use in program maintenance and end-user documentation

5.1    Record the final state of the program in a form suitable for subsequent maintenance

5.2    Provide end-user documentation that meets the user’s needs


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