Completing and reading a structure diagram

Name:

Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. A structure diagram has the top box 'Run a school canteen order system' with sub-boxes 'Take orders' and 'Print receipts', and one box is missing. Which box best fills the gap?

A Draw a flowchart

B Calculate total cost

2. Which way do you read a structure diagram to complete it?

A Top down: start at the parent box, then work out its sub-boxes

B Bottom up: start with the smallest boxes and guess the parent

3. The parent box is 'Check a password'. Its sub-boxes are 'Check length' and 'Check for a digit'. Which box would fill a third gap?

A Play background music

B Check for a capital letter

4. True or false: the sub-boxes under a parent box should together make up the whole of the parent box.

A True

B False

5. The parent box is 'Make a quiz game'. Sub-boxes are 'Ask questions', 'Check answers' and 'Design a school logo'. Which box does not belong?

A Design a school logo

B Check answers

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1Quiz game: Ask question, ___, Show score		ALogin: Enter username, Enter password, Check details
2Run school canteen > Take orders > Write order		BA sub-box is missing. Enter username and Check details are needed so the sub-boxes make up the whole parent box.
3The sub-boxes together must make up the parent box		CA missing box: fill the gap with a sub-problem the parent needs, such as Check answer
4Fill a missing box with a sub-problem the parent box needs		DCalculate bill: Add prices, ___ = Add tax, Print receipt
5Weather app: Show forecast, Play music, Get data		EPlay music is a box that does not belong. It is not needed to solve the parent problem, so remove it.
6Login: Enter password		FReading from the top down: start with the whole problem, then follow each level to smaller sub-problems

Definitions

complete a structure diagram

Fill in the Blanks

Complete each line of code by filling in the missing parts.

Withdraw cash Check PIN | Enter amount | _________

______________ Borrow book | Return book | Pay fine

Find average mark Get marks | ____________ | Divide by count

Make toast Get bread | Toast bread | Wash car Box to remove: ________

Level 1: Online shop Level _: Browse | Pay | Deliver Level 3: Enter card details (under Pay)

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A Make a school report

B Buy new shoes

C Calculate averages

D Print report

Question 2

A Online shopping

B Check PIN

C Choose amount

D Give cash

Question 3

A Weather station

B Record data

C Eat lunch

D Read rain gauge

Question 4

A Login system

B Enter details

C Check details

D Play music

Question 5

A Mobile game

B Start game

C Play level

D Make the whole game

Answer Key

Completing and reading a structure diagram

Section A: Quick Questions

B — Calculate total cost

A — Top down: start at the parent box, then work out its sub-boxes

B — Check for a capital letter

A — True

A — Design a school logo

Section B: Match the Pairs

Quiz game: Ask question, ___, Show score → A missing box: fill the gap with a sub-problem the parent needs, such as Check answer

Run school canteen > Take orders > Write order → Reading from the top down: start with the whole problem, then follow each level to smaller sub-problems

The sub-boxes together must make up the parent box → Login: Enter username, Enter password, Check details

Fill a missing box with a sub-problem the parent box needs → Calculate bill: Add prices, ___ = Add tax, Print receipt

Weather app: Show forecast, Play music, Get data → Play music is a box that does not belong. It is not needed to solve the parent problem, so remove it.

Login: Enter password → A sub-box is missing. Enter username and Check details are needed so the sub-boxes make up the whole parent box.

Section C: Definitions

complete a structure diagram — Read the given boxes top down, then fill each gap with the sub-problem its parent box needs, so the sub-boxes together make up the parent. Ignore boxes that do not belong.

Section D: Fill in the Blanks

Withdraw cash
  Check PIN | Enter amount | Give cash

Library system
  Borrow book | Return book | Pay fine

Find average mark
  Get marks | Add up marks | Divide by count

Make toast
  Get bread | Toast bread | Wash car
Box to remove: Wash car

Level 1: Online shop
Level 2: Browse | Pay | Deliver
Level 3: Enter card details (under Pay)

Section E: Spot the Error

B — 'Buy new shoes' does not belong. Every sub-box must be part of solving the parent box. It should be a sub-problem such as 'Collect marks'.

A — Reading top down, the parent box must be the problem that the sub-boxes together make up. Check PIN, Choose amount and Give cash make up 'ATM withdrawal', not 'Online shopping'.

C — 'Eat lunch' does not belong under 'Record data'. The missing box must be a sub-problem the parent needs, such as 'Read thermometer', so that the sub-boxes together make up 'Record data'.

D — 'Play music' does not belong in a login system. The missing box should be a sub-problem that the parent needs, such as 'Allow access'.

D — 'Make the whole game' just repeats the parent box. A sub-box must be a smaller part of the problem, such as 'Show high score'.