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Software Engineering in CS at APU. CS 470 Software Engineering I. Sheldon X. Liang Ph. D. October 1, 2014. Azusa, CA. 1. October 1, 2014. Azusa Pacific University, Azusa, CA 91702, Tel: (800) 8 25-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/.

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October 1 2014

Software Engineering in CS at APU

CS 470 Software Engineering I

Sheldon X. Liang

Ph. D.

October 1, 2014

Azusa, CA

1

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

CS 470 (SE)2

2

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What is a system

 What is systems engineering

 What is systems engineering process

 What we learn from systems engineering

Break down: Problem Definition (PRD)

Model&Interface: Problem Design (SDD)

Unit coding: Programming (SPP)

Put-together: Integration (SIP)

 What we are going to do with DFD

3

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What is a system

Components - A purposeful collection of inter-related components working together to achieve some common objective.

External Entities - A system may include software, mechanical, electrical and electronic hardware and be operated by people.

External Dependencies - System components are dependent on other system components

Collaboration - The properties and behavior of system components are inextricably intermingled

problem requirements definition: identification of data & operation

4

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What is systems engineering

Systems Engineering (SE) is an interdisciplinary field of engineering, that focuses on the development and organization of complex artificial systems.

Systems Engineering integrates other disciplines and specialty groups into a team effort, forming a structured development process that proceeds from concept to production to operation and disposal.

Systems Engineering considers both the business and the technical needs of all customers, with the goal of providing a quality product that meets the user needs

Structured development process: Analysis vs Synthesis

5

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What is systems engineering process

6

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we learn from systems engineering

Break down: Problem Definition (PRD)

Model&Interface: Problem Design (SDD)

Unit coding: Programming (SPP)

Put-together: Integration (SIP)

7

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we learn from systems engineering

8

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

V

 What we learn from systems engineering

V

9

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

V

 What we learn from systems engineering

From Conceptual to Complete

V

From break-down to put-together

10

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we learn from systems engineering

V

Requirement Analysis

Functional Analysis/Allocation

Integration / Synthesis

11

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we learn from systems engineering

PRD & SDD

V

Problem Definition (PRD)

-- Identify external entities

-- identify major components

-- identify links (dataflow)

Requirement Analysis

Functional Analysis

Functional Allocation

Problem Design (SDD)

-- functional allocation

-- activities & interface

-- identify further components

-- identify links

12

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we’re going to do with DFD

V

V

13

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we’re going to do with DFD

V

14

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we’re going to do with DFD

PRD:

-- External Entities

 Customer Keypad

 Card Reader

 Control System

 Customer Display

 Printout Dispenser

 Cash Dispenser

-- Functional Level-0

 Auto Teller System

15

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we’re going to do with DFD

PRD (Refined):

-- External Entities

-- Functional Level-1

 Receive operator command

 Verify PIN from card

 Display customer options

 Prepare command

 Update display

 Prepare message

 Prepare printout

 Mange withdrawal

V

16

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we’re going to do with DFD

SDD (description):

The CheckPIN procedure handles the verification of the customer's Personal Identification Number (PIN) using data retrieved from the card's magnetic strip. The procedure invites the customer to enter their PIN using the keypad. If this does not match the PIN stored on the card, a limited number of retries is permitted, after which the card is confiscated as a security precaution. If the correct PIN is entered, the Services procedure is called.

V

17

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we’re going to do with DFD

SDD (pseudo-code):

PROCEDURE CheckPIN

CONSTANTS

MAXPINS IS 3

VARIABLES

PINCounter IS NUMBER

BEGIN

read data from card

set PINCounter to zero

LOOP UNTIL PINCounter is equal to MAXPINS

input PIN from customer keypad

IF entered PIN matches card PIN

THEN EXITLOOP

ENDIF

add 1 to PINCounter

ENDLOOP

IF PINCounter is equal to MAXPINS

THEN confiscate customer's card

ELSE CALL PROCEDURE Services

ENDIF

END CheckPIN

V

18

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we’re going to do with DFD

Problem Requirements Definition (PRD)

PRD0 = Major_Operation + ∑ External_entities

PRD* = ∑ Functional_allocation (tasks) + ∑ Dataflows

Software Design Document (SDD)

SDD = ∑ Functional_Description (strategic psuedo-code)

Software Project Plan

SPP = ∑ Scheduled Implementation (coding & testing plan)

19

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

 What we’re going to do with DFD

Program = DataStructure + Algorithm:

/* Data Pool */

… …

void Op1 (… …)

{

}

int Fun2 (… …)

{

}

void Op3 (… …)

{

}

float Fun4 (… …)

{

}

int main ()

{

… …

}

Data Pool

Op1

Fun2

Op3

Fun4

20

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


October 1 2014

Software Engineering in CS at APU

(SE)2: System Engineering vs Software Engineering

Thank you very much!

Questions?

21

October 1, 2014

Azusa Pacific University, Azusa, CA 91702,Tel: (800) 825-5278

Department of Computer Science,http://www.apu.edu/clas/computerscience/


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