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AS Level · Information Technology 9626

Custom-written software and off-the-shelf software

Revise Custom-written software and off-the-shelf software for Information Technology 9626 (AS Level) — revision notes, 82 practice questions and instant AI marking.

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Custom-written vs Off-the-shelf Software (2.4)

Information Technology 9626

Choosing Between Custom Solutions and Commercial Software

Interactive Revision Notes with Self-Testing

Software Decision: What to Choose?
Custom-written Software
Off-the-shelf Software
Detailed Comparison
Advantages and Disadvantages Table
Real-World Scenarios
Summary and Review

1. Software Decision: What to Choose?

Learning Objectives:

Understand the difference between custom-written and off-the-shelf software
Identify when each type is appropriate
Evaluate advantages and disadvantages of each approach
Make informed decisions about software selection

The Software Problem

When a company installs a new computer system, a critical decision must be made: What application software should we use?

Companies need software for many tasks:

Word processing (creating documents)
Accounting and invoicing
Databases (employee records, stock control, customer accounts)
Websites
Payroll processing
Business intelligence and reporting

The Challenge: Finding the most appropriate software is difficult. A wrong decision means the company may need to keep modifying the system or even abandon it completely and start over.

Two Main Options:

Buy off-the-shelf software (already exists, ready to use)
Hire programmers to create custom-written software (designed specifically for you)

Quick Question 1

Why is choosing the right software so important for a company?

2. Custom-written Software

What is Custom-written Software?

Custom-written Software: Software that is specially written for a particular task and developed for a specific organisation (company, business, or individual). It is tailored to meet the exact requirements of that organisation.

Key characteristic: Custom software is unique—created specifically for ONE client's needs.

Who Uses Custom-written Software?

Large Organizations

Large companies often employ programmers (or hire consulting firms) to create software specifically for their needs:

Banks creating transaction processing systems
Insurance companies building policy management systems
Manufacturing firms developing production control software
Government agencies needing specialized systems

Organizations with Unique Needs

Some organizations have specialized or unique requirements:

Databases: Employee records, stock control, customer account management
Websites: Banks, online stores, sports clubs—each needs unique features
Integrated Systems: Combinations of website + database + spreadsheet features
Business-Critical: Systems that can't use generic solutions

When Individuals Use Custom Software

Individuals rarely need custom software because:

Individual needs are usually covered by off-the-shelf software
Custom development is too expensive for most individuals
Basic word processing, email, spreadsheets handle most personal tasks

Exception: A small business with complex, unique needs (e.g., specialized e-commerce with custom integrations) might invest in custom software.

Ownership of Custom Software

Important distinction:

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Also in the full note

3. Off-the-shelf Software
4. Detailed Comparison
5. Advantages and Disadvantages Table
6. Real-World Scenarios
7. Summary and Review
Software Solutions: Complete Overview
Master These Software Decision Concepts Checklist
🎯 Exam Success Tips for Software Choice

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