Design

DesignA good design makes implementation easier

The design breaks the program down into smaller blocks

The aim is to develop an algorithm – a set of instructions for completing a task

DesignDesign should be modular – allows us to break

a bigger program into smaller parts

Different modules can be programmed by different people

Top-down design involves looking at the main problem and breaking it down into smaller more manageable modules

DesignThis process is repeated, breaking the

problems into smaller steps. This is known as stepwise refinement

Bottom-up design means beginning with the smaller modules and building the design into a bigger solution

Design NotationsFlow chart

Design NotationsFlow chart

Design NotationsStructure

diagram

Design NotationsPseudocode

1.take in numbers2.add numbers3.display numbers

Design NotationsPseudocode

1.take in numbers2.add numbers

1. initialise total2. repeat for each number

1. add number to total

3. end repeat3.display numbers

DesignThe Human Computer Interface (HCI) is the

way in which a computer program interacts with a user.

There are a number of rules which a HCI should adhere toe.g. Menu selection, command input and data display should be consistent

Task: Create an Etherpad to develop a class list of HCI rules