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process methods in. ZERO-DEFECT. software engineering. process methods in. ZERO-DEFECT. INTRODUCTION. software engineering. What are zero-defect methods?. “Zero-defect methods are practices that aim for zero defects in the software before software is built.”. process methods in.

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slide1

process methods in

ZERO-DEFECT

software engineering

slide2

process methods in

ZERO-DEFECT

INTRODUCTION

software engineering

What are zero-defect methods?

“Zero-defect methods are practices that

aim for zero defects in the software

before software is built.”

slide3

process methods in

ZERO-DEFECT

INTRODUCTION

software engineering

Why zero-defect methods?

  • Software testing can only remove about 73%of defects on average
  • Software testing can be impossible to carryout in specific end systems (asynchronousentities, embedded systems)

“The expensive and inefficient phase of software testing

can be avoided with the use of zero-defect methods.”

slide4

process methods in

ZERO-DEFECT

INTRODUCTION

software engineering

About Sitoni Oy

  • Sitoni Oy is a software engineering, consultingand training company established in 1991
  • Its software aims for elastic management andhandling of data
  • The software seeks to abandon predefineddefinitions of processed data
slide5

process methods in

ZERO-DEFECT

INTRODUCTION

software engineering

About Sitoni Oy

  • The software attempts to manage largeheterogeneous flows of data and solve thedemanding data processing problems relatingto them

Continue?

slide6

process methods in

ZERO-DEFECT

INTRODUCTION

software engineering

The work consists of two parts

  • Research part
    • Researching Sitoni zero-defect concepts
  • Development part
    • Developing the media for the researchedconcepts
slide7

process methods in

ZERO-DEFECT

PHASES OF THE WORK

software engineering

Phases of the work:

Preliminary Study

Analysis / Requirements Definition

Design

Implementation

QA / Testing / Deployment

slide8

process methods in

ZERO-DEFECT

PHASES OF THE WORK

software engineering

Preliminary study

  • Project plan
  • Schedule with phases and milestones
  • Development web site (for the supervisor)
slide9

process methods in

ZERO-DEFECT

PHASES OF THE WORK

software engineering

Requirements Definition

  • Division of requirements (content part,web site part)
  • Definition of individual requirements and theirpriorities
  • Combining the content requirements into largerentities
slide10

process methods in

ZERO-DEFECT

PHASES OF THE WORK

software engineering

Design

  • Designing of the linguistic issues of the contentpart
  • Designing of the web site (“User Interface”,appearance, markup language, highest leveluse cases, script intended functions, etc.)
slide11

process methods in

ZERO-DEFECT

UML USE CASE EXAMPLE

software engineering

slide12

process methods in

ZERO-DEFECT

PHASES OF THE WORK

software engineering

Implementation

  • Writing of the content part
  • Implementing the web site by the design
    • Standard markup language XHTML 1.0
    • Modular design
    • User-agent dependencies avoided
slide13

process methods in

ZERO-DEFECT

CONTENT EXAMPLE

software engineering

Content Example:

The WndProc function (WinAPI)

slide15

process methods in

ZERO-DEFECT

CONTENT EXAMPLE

software engineering

Adding basic zero-defect concepts to the

default form of the WndProc function

  • Removing of extra return statements so that thefunction complies with an axiom of one input –one output
  • Adding basic parameter checking
    • Is the hwnd handle valid? (IsWindow)
    • Safety limits for msg parameter
  • Making code layout systematic and to supportzero-defect concepts
slide16

process methods in

ZERO-DEFECT

WEB SITE EXAMPLE

software engineering

Web site Example: PHP-function

write_hit_log ($file_name,$file_size)

“Gathers date, time, IP-address, user-agent information and writes them

to a text file (log). The current entry is not appended to the end of thetext file but previous entries are read from the file first and then thecurrent entry is written to the beginning of the file followed by theprevious entries. The relative path of the log file is given as a parameter‘$file_name’. The maximum limit of the size of the text file size is givenas parameter ‘$filesize_limit’. When this limit is exceeded it willoverwrite the file and start from 0 bytes. This function does not returnanything.”

slide17

process methods in

ZERO-DEFECT

WEB SITE EXAMPLE

software engineering

function write_hit_log ($file_name,$file_size_limit) {

$truncate_ok_flag = FALSE ;

$rewind_ok_flag = FALSE ;

$write_ok_flag = FALSE ;

$file_size = NULL ;

$in_buffer = NULL ;

$out_buffer = NULL ;

$date = &get_server_date (0) ;

$time = &get_server_time (0) ;

$ip_address = &get_remote_address ();

$user_agent = &get_user_agent () ;

$file_handle = NULL ;

settype ($truncate_ok_flag,"boolean") ;

settype ($rewind_ok_flag,"boolean") ;

settype ($write_ok_flag,"boolean") ;

settype ($file_size,"integer") ;

settype ($file_size_limit,"integer") ;

settype ($file_name,"string") ;

settype ($in_buffer,"string") ;

settype ($out_buffer,"string") ;

settype ($date,"string") ;

settype ($time,"string") ;

settype ($ip_address,"string") ;

settype ($user_agent,"string") ;

slide18

process methods in

ZERO-DEFECT

WEB SITE EXAMPLE

software engineering

if ($file_name != NULL) {

if ($file_size_limit > 0) {

$file_handle = fopen ($file_name,"r+") ;

if ($file_handle != FALSE) {

$file_size = filesize ($file_name) ;

if ($file_size < $file_size_limit) {

$in_buffer = fread ($file_handle,$file_size) ;

$out_buffer = $date . "," . $time . "," . $ip_address . "," .

$user_agent . "\n" . $in_buffer ;

$rewind_ok_flag = rewind ($file_handle) ;

if ($rewind_ok_flag != FALSE) {

$write_ok_flag = fwrite ($file_handle,$out_buffer) ;

if ($write_ok_flag != FALSE) {

;

} else {

echo "\nAn expected event has happened in the PHP script: Unable

to write to the file\n" ;

}

} else {

echo "\nAn expected event has happened in the PHP script: Unable to

rewind the file pointer\n" ;

}

} else {

$truncate_ok_flag = ftruncate ($file_handle,0) ;

if ($truncate_ok_flag != FALSE) {

$rewind_ok_flag = rewind ($file_handle) ;

if ($rewind_ok_flag != FALSE) {

$out_buffer = $date . "," . $time . "," . $ip_address . "," .

$user_agent . "\n" ;

$write_ok_flag = fwrite ($file_handle,$out_buffer) ;

slide19

process methods in

ZERO-DEFECT

WEB SITE EXAMPLE

software engineering

if ($write_ok_flag != FALSE) {

;

} else {

echo "\nAn expected event has happened in the PHP script:

Unable to write to the file\n" ;

}

} else {

echo "\nAn expected event has happened in the PHP script: Unable

to rewind the file pointer\n" ;

}

} else {

echo "\nAn expected event has happened in the PHP script: Unable to

truncate the file\n" ;

}

}

fclose ($file_handle) ;

} else {

echo "\nAn expected event has happened in the PHP script: Unable to open

a file\n" ;

}

} else {

echo "\nAn expected event has happened in the PHP script: Invalid filesize

parameter\n" ;

}

} else {

echo "\nAn expected event has happened in the PHP script: Invalid filename

parameter\n" ;

}

}

?>

slide20

process methods in

ZERO-DEFECT

PHASES OF THE WORK

software engineering

QA / Testing / Deployment

  • Website quality controlled with validationservices provided by W3C
  • Content quality controlled by linguisticchecking
  • Testing carried out by viewing the web sitewith several different browsers
  • Deployment consists of setting-up the web siteon the client’s web server
slide21

process methods in

ZERO-DEFECT

FUTURE DEVELOPMENT

software engineering

Future Development

  • Studying of zero-defect methods profoundlyand on a wider scale
  • Results combined into a full scientific specificationof the process
  • The study could be published as an appendingspecification or a full-length book
  • Adding the interactivity level of the web site
slide22

process methods in

ZERO-DEFECT

CONCLUSIONS

software engineering

Conclusions

  • The project succeeded in terms of the requiredspecification and defined schedule
  • The pragmatic orientation diminishes the scientificvalue of the content part
  • Sitoni zero-defect concepts are independent andextremely contrary to “normal” SE methods
    • A hope that this thesis work enlightens theworld of zero-defect programming
slide23

process methods in

ZERO-DEFECT

software engineering