1. Computational Thinking (How to think like a computer scientist)
Lesson 2
Algorithms

2. Objectives To know the term ‘Algorithm’ means
To create algorithms to everyday situations

3. Recap - The four cornerstones of Computer Science

4. What is an algorithm?
Algorithms are one of the four cornerstones of Computer Science. 
An algorithm is a plan, a detailed set of step-by-step instructions to solve a problem. 
If you can:
tie shoelaces
make a cup of tea
get dressed
prepare a meal
then you already know how to follow an algorithm.

5. Video

6. Describing Algorithms
There are two ways of describing an algorithm:
Flowcharts – A graphical representation of the steps involved
Pseudocode – English like instructions detailing every step

7. Activity 1 Download the Sequencing Worksheet from this link:
Worksheet.docx Or
Make sure that you save it to your CT folder.
Open the document and follow the instructions

8. Algorithm
Problem:
How would you write an algorithm that draws this picture of a house like this?:
Clue: Think about last lesson’s topic on decomposition

9. The Top Level Draw the outline of the house Draw the chimney
Draw the door
Draw the windows
Main
Draw
Outline
Draw
Chimney
Draw
Door
Draw
Windows

10. Activity 2 – Drawing the Windows
Complete the task on Page 2 of the Sequencing Worksheet
Remember to save your work!
Download the starter code using this link:
rter.txt Or