Data flow diagram (Level 1): processes

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Quick Questions

Shade in the A or B circle for each question.

1. Which process label follows Level 1 DFD conventions?

A Order Validation System

B 1.0 Validate Order

2. What does a Level 1 DFD do to the single system shown in the context diagram?

A Breaks it into its main processes

B Replaces it with a list of users

3. Which process name is written correctly for a Level 1 DFD?

A 2.0 Calculate Total

B Calculator

4. Which set of process numbers is correct for the main processes in a Level 1 DFD?

A Red, Blue, Green

B 1.0, 2.0, 3.0

5. A student draws a Level 1 DFD for an online shop. Which process is named best?

A 3.0 Process Payment

B 3.0 Payments

Match the Pairs

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

Left column		Right column
12.0 Process Payment		AThe process has no number and is named with a noun only, so it does not show an action
21.0, 2.0, 3.0 on the processes		B3.0 Generate Report
3A Level 1 DFD splits the single system from the context diagram into its main processes		CA correctly written Level 1 process: it has a number and a verb-noun name that describes one main task
4Process names use a verb followed by a noun to describe the action performed		DContext: Online Shop System -> Level 1: 1.0 Validate Order, 2.0 Process Payment, 3.0 Dispatch Goods
5Payments		ENumbering that identifies each main process and its order in the Level 1 diagram
61.0 Order Validation Online Shop System		FThe name is a noun phrase and repeats the whole system name, so it does not show one main task

Definitions

Level 1 DFD process

Fill in the Blanks

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

___ Validate Order 2.0 Process Payment 3.0 Send Receipt

1.0 Validate Order ___ Process Payment 3.0 Send Receipt

Process name = ____ + noun

Process name = number + verb + ____

Level 1 DFD breaks down the Level _ system

Spot the Error

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

Question 1

A Context: Online Shop System

B 1.0 Order Validation

C 2.0 Process Payment

D 3.0 Dispatch Goods

Question 2

A Check Login Details

B 2.0 Update Timetable

C 3.0 Send Notification

Question 3

A Level 1 DFD: Library System

B 1.0 Register Member

C 1.0 Issue Loan

D 3.0 Record Return

Question 4

A Context: Canteen System

B 1.0 Student

C 2.0 Calculate Total

D 3.0 Print Receipt

Question 5

A Context: Gym Booking System

B 1.0 Check Availability

C D2 Create Booking

D 3.0 Send Confirmation

Answer Key

Data flow diagram (Level 1): processes

Section A: Quick Questions

B — 1.0 Validate Order

A — Breaks it into its main processes

A — 2.0 Calculate Total

B — 1.0, 2.0, 3.0

A — 3.0 Process Payment

Section B: Match the Pairs

2.0 Process Payment → A correctly written Level 1 process: it has a number and a verb-noun name that describes one main task

1.0, 2.0, 3.0 on the processes → Numbering that identifies each main process and its order in the Level 1 diagram

A Level 1 DFD splits the single system from the context diagram into its main processes → Context: Online Shop System -> Level 1: 1.0 Validate Order, 2.0 Process Payment, 3.0 Dispatch Goods

Process names use a verb followed by a noun to describe the action performed → 3.0 Generate Report

Payments → The process has no number and is named with a noun only, so it does not show an action

1.0 Order Validation Online Shop System → The name is a noun phrase and repeats the whole system name, so it does not show one main task

Section C: Definitions

Level 1 DFD process — A numbered, named step (e.g. 1.0 Validate Order) in a Level 1 DFD. It uses a verb phrase and shows one main task from the context diagram's single system.

Section D: Fill in the Blanks

1.0 Validate Order
2.0 Process Payment
3.0 Send Receipt

1.0 Validate Order
2.0 Process Payment
3.0 Send Receipt

Process name = verb + noun

Process name = number + verb + noun

Level 1 DFD breaks down the Level 0 system

Section E: Spot the Error

B — Level 1 process names use a verb phrase (verb + noun). 'Order Validation' is a noun phrase. It should be '1.0 Validate Order'.

A — Every Level 1 process must be numbered. This process has no number. It should be '1.0 Check Login Details'.

C — Each process needs its own unique number. 1.0 is already used by Register Member, so this process should be '2.0 Issue Loan'.

B — 'Student' is an external entity, not a process. A process is a task the system performs and needs a verb phrase, such as '1.0 Take Order'.

C — Processes are numbered 1.0, 2.0 and so on. A 'D' prefix is used for data stores. It should be '2.0 Create Booking'.