Lecture E-Commerce - Chapter 6: Building e-commerce web sites (part I)

CSC 330 E-Commerce
Teacher

Ahmed Mumtaz Mustehsan
GM-IT CIIT Islamabad

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Virtual Campus, CIIT
COMSATS Institute of Information Technology

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T1-Lecture-6


Building E-Commerce Web Sites

Chapter-3
Part-I

T1-Lecture-6

For Lecture Material/Slides Thanks to:
Copyright © 2010 Pearson Education, Inc


Objectives
 Explain

the process that should be followed in building
an e-commerce Web site.
 Describe the major issues surrounding the decision to
outsource site development and/or hosting.
 Identify and understand the major considerations
involved in choosing Web server and e-commerce
merchant server software.
 Understand the issues involved in choosing the most
appropriate hardware for an e-commerce site.
 Identify additional tools that can improve Web site
performance.

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Ahmed Mumtaz Mustehsan

Copyright © 2010 Pearson Education, Inc

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Building an E-commerce Site:
A Systematic Approach
Most important management challenges:
Developing

a clear understanding of business

objectives.

The

objectives are to be explained to the developers
and programmers.
Knowing

how to choose the right technology to
achieve those objectives

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Pieces of the Site-Building Puzzle
Main areas where you will need to make decisions:
Human

resources and organizational capabilities

◦Creating team with skill set needed to build and
manage a successful site
Hardware
Software
Telecommunications
Site

design

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The Systems Development Life Cycle
Methodology for understanding business objectives of
a system and designing an appropriate solution
Five

major steps:

1. Systems analysis/planning
2. Systems design
3. Building the system
4. Testing
5. Implementation

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Web Site Systems Development Life Cycle

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Ahmed Mumtaz Mustehsan

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1. System Analysis/Planning
Business objectives:
List of capabilities you want your site to have
System functionalities:
List of information system capabilities needed to
achieve business objectives
Information requirements:
 Information elements that system must produce in
order to achieve business objectives

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2. Systems Design:
Hardware and Software Platforms
System design specification:
Description of main components of a system and their
relationship to one another
Two components of system design:
1.Logical design

Data flow diagrams, processing functions,
databases
1.Physical design
Specifies actual physical, Hardware and software
components, models, etc. needed for the
implementation of Logical design
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Logical Design for a Simple Web Site

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Physical Design for a Simple Web Site

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Build/Host Your Own versus Outsourcing
Outsourcing:
Hiring

site

vendors to provide services involved in building

Build own vs. outsourcing:
Build your own requires team with diverse skill set;
choice of software tools; both risks and possible benefits
Host own vs. outsourcing
Hosting: hosting company responsible for ensuring site
is accessible 24/7, for monthly fee
Co-location:

firm purchases or leases Web server (with
control over its operation), but server is located at
vendor’s facility

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Choices in Building and Hosting

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Testing, Implementation, and Maintenance
Testing
Unit testing

unit testing involves testing the site’s program modules
one at a time
System testing
system testing involves testing the site as a whole, in a
way the typical user will use the site.
Acceptance testing
acceptance testing verifies that the business
objectives of the system as originally conceived are in
fact working

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Testing, Implementation, and Maintenance
Implementation and maintenance:
Maintenance is ongoing process
Maintenance costs: parallel to development costs
Benchmarking
benchmarking a process in which the site is compared
with those of competitors in terms of response speed,
quality of layout and design

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Factors in Web Site Optimization

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Web Site Budgets
From $5,000 to millions of dollars/year
Depends on what you can afford
Components of budget:
 System maintenance
 System development
 Content design & development
 Hardware
 Telecommunications
 Software.

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Simple versus Multi-tiered Web Site
Architecture
System architecture
Arrangement of software, machinery, and tasks in an
information system needed to achieve a specific
functionality.
Single Tier Architecture
it consisted of a server computer running basic Web

server software.
Two-tier
Web server and database server
Multi-tier
Web application servers
Backend, legacy databases
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Two-Tier E-commerce Architecture

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Multi-tier E-commerce Architecture

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Privativate Lines

CSU/DSU ROUTER

Internet

CSU/DSU ROUTER

VPN Concentratror

CSU/DSU ROUTER
VPN Concentratror
CSU/DSU ROUTER
Router

Load balancer

Router

Server

Server

Server Server Server

Server

Server

Server Server

Load balancer

Server

Server

Server

Server

Server

Server

CSU/DSU ROUTER

Load balancer

CSU/DSU ROUTER

Switch
Firewall

Server

Server Server

CSU/DSU ROUTER

Msg Server Farm

Firewall

Firewall

CSU/DSU ROUTER

Load balancer

Firewall
switch

Firewall

Switch

Switch

Switch

Minicomputer

Firewall

Disk array

Server Server
Server Server Server

Server

Server

Server

Server Server Server Server Server Server

Minicomputer

Server
Server Server Server Server

Server Server ServerServer Server Server

Switch
Web Server farm

Minicomputer

Server

Server

Disk array

Server
Switch

Switch

Switch

Switch

Application Server farm

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Copyright © 2010 Pearson Education, Inc

Minicomputer

Switch

DB SERVER FARM

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Web Server Software
Apache
Leading Web server software (47% of market)
Works only with UNIX, Linux OSs
Microsoft’s Internet Information Server (IIS)
Second major Web server software (25% of market)
Windows-based

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Functionalities of Webserver

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Site Management Tools
Basic tools
Included
Verify

in all Web servers

that links on pages are still valid

Identify

orphan files

Third-party software and services for advanced site
management
Monitor

customer purchases, marketing campaign
effectiveness, etc.
Examples: WebTrends Analytics 9, Google Analytics
 />
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