1. Unit 6
Application
Design
KLB Assignment

2. Scenario 1 Part A – Training Part B – Designing the application
Part C – Client brief

3. Part B – Designing the application
You will be required to:
compare different application development models and select which model you will use for your application design;
gather and document the client’s requirements;
identify possible solutions and produce a feasibility study for the client;
prepare their designs and present them to the client;
negotiate and document any adaptations agreed with the client;
develop a prototype;
test the prototype and gather feedback from the client/user;
analyse the feedback and implement any changes required.

4. Task 1 – Application dev. models
Similarities
Differences
How/choice model is appropriate for a project
Select dev. model

5. What is an application?
An application is basically a type of software.
A main point that makes a software an application is that it’s executable.
The main goal of an application is to perform a specific task or range of tasks.
Applications are OS specific.

6. What is an application?
A computer program that is created for a particular purpose.

7. Characteristics and features of application development models
Definition
Investigation & Analysis
Design
Implementation
Testing
Installation
Documentation
Evaluation
Maintenance
requirements analysis
design
Implementation/ coding
testing
deployment
maintenance
SYSTEM LIFE CYCLE
Application development models divide the process of development into distinct phases.
Development processes vary depending on the model but all include, in some form stages, i.e.:
• requirements analysis
• design
• implementation/coding
• testing
• deployment
• maintenance

8. Characteristics and features of application development models
requirements analysis
design
Implementation/ coding
testing
deployment
maintenance
Application Development Models
waterfall model
iterative model
agile development model
rapid application development (RAD) model
spiral model
prototype model

9. Waterfall model
requirements analysis
This model lets the developer move through the phases in order but with the option to return to the previous phase if needed.
The developer can continue to move back up the phases, but must move back down in order.
design
implementation/ coding
testing
deployment
maintenance

10. Iterative model
requirements analysis
design
implementation/ coding
testing
deployment
maintenance
requirements analysis
design
implementation/ coding
testing
deployment
maintenance
requirements analysis
design
implementation/ coding
testing
deployment
maintenance
Project split into smaller modules, where each is build using the lifecycle.
An system might be split into several modules with a separate iteration. 1 2 3

11. Agile development model
This model allows a product to be worked on, changed and improved iteratively.
It starts with a small part of the product meeting some of the requirement, then the next version may have additional features added for further requirements.
This process repeats until final product is developed.

12. Rapid application development (RAD) model
It is a type of incremental model.
In RAD model the components or functions are developed in parallel as if they were mini projects.
The developments are time boxed, delivered and then assembled into a working prototype.

13. Spiral model
Makes use of prototypes that are worked on refined as the SLF repeats.
First time through, a prototype is developed which is evaluated.
This leads to further design and adaptions of the prototype which is tested and evaluated, leading to further design changes and so on.
This continues until finished product.

14. Prototype model
Prototypes are developed in the early stages, for example to demonstrate the functional requirements or the design of areas of the product.
These are shown to the client who provides feedback for refinement.
These prototypes can be refined or thrown away as a new prototype is developed.

15. Links
System Life Cycle: ict.com/as_a2_ict_new/ocr/A2_G063/331_systems_cycle/s lc_stages/miniweb/pg4.htm
Case Study (SLC): study-of-the-application-of-the-systems- development?rgn=main;view=fulltext
What are system development models?: development-models/