Topic 5: Wireless E-Commerce
Website Developement
E-Commerce
BED 4103
Web Site Development
• Factors to be considered:
– Cost
– Capability
– Constraints
• System development life cycle (SDLC) is a
methodology for understanding the business
objectives of any system and designing an
appropriate solution.
SDLC Method
System Analysis
– Having a Business Objective
– Develop a System Functionalities
Business Objective
• There are nine basic business objectives that an e-
commerce site must deliver.
• These objectives must be translated into a description of
system functionalities and ultimately into a set of precise
information requirements.
System Design
– Logical design
includes a data flow diagram that describes the flow of
information at your e-commerce site, the processing
functions that must be performed, and the databases
that will be used.
– Physical design
translates the logical design into physical
components. For instance, the physical design
details the specific model of server to be
purchased, the software to be used, the size of the
telecommunications link that will be required, the
way the system will be backed up and protected
form outsiders, and so on.
Building the System
• Outsourcing means that you will hire an outside vendor to
provide the services involved in building the site that you
cannot perform with in-house personnel.
• Build Your Own versus Outsourcing
– Pros
• Customing your needs
– Cons
• Complexity
• Host Your Own versus Outsourcing
– Pros
• Don’t have to trouble with technicalities
– Cons
• as the online business grows, the company may need
more power and services than the hosting company
can provide.
Testing
• Unit testing involves testing the site’s program
modules one at a time.
• System testing involves testing the site, as a whole in a
way the typical user will in using the site. Because
there is no truly “typical’ user, system testing requires
that every conceivable path be tested.
• Final acceptance testing requires that the firm’s key
personnel and managers in marketing, production,
sales, and general management actually use the system
as installed on a test Internet on intranet server.
Implementation and Maintenance
• 20% of the time is devoted to debugging
codes and responding to emergency situations
• 20% of the time is concerned with changes in
reports, data files, and links to backend
databases.
• 60% of maintenance time is devoted to
general administration (making product and
price changes in the catalog) and making
changes and enhancements to the system.
• Secrets of Success
– Depends on a dedicated team of employees (the
Web team) whose sole job is to monitor and
adapt the site to changing market conditions.
• listen to customers’ feedback on the site, and respond
to that feedback as necessary.
• develop a systematic monitoring and testing plan to be
followed weekly to ensure all the links are operating,
prices are correct, and pages are updated.
• benchmarking (a process in which the site is compared
with those of competitors in terms of response speed,
quality of layout, and design) and keeping the site
current on pricing and promotions.
• Choosing Server Software
– Simple versus Multi-tiered Web Site Architecture
– two-tier architecture, a Web server responds to
requests for Web pages and a database server
provides backend data storage.
– Multi-tier architecture, in contrast, the Web server is
linked to a middle-tier layer that typically includes a
series of application servers that perform specific
tasks, as well as to a backend layer of existing
corporate systems containing product, customer, and
pricing information.
• A multi-tiered site typically employs several or more physical
computers, each running some of the software applications
and sharing the workload across many physical computers.
Web Server Software
• Apache HTTP, the leading Web server software, with
over 60% of the market, is, which works only with
the Unix operating system.
• Microsoft Internet Information Server (IIS) is the
second major Web server software available, albeit a
distant second to Apache, with only about 20% of
the market.
Basic functionalities provided by all
Web servers
Application Servers
E-commerce Merchant Server
Software Functionality
• Online Catalog
– A company that wants to sell products on the Web
must have an online catalog, which lists all of its
products available on its Web site.
• Shopping Cart
– Online shopping carts are much like their real-world
equivalent; both allow shoppers to set aside desired
purchases in preparation for checkout.
• Credit Card Processing
– A site’s shopping cart typically works in conjunction
with credit card processing software, which verifies
the shopper’s credit card and then puts through the
debit to the card and the credit to the company’s
account at checkout.
• Right-sizing your Hardware Platform
– The Number of Simultaneous Users Who Will
Likely Visit Your Site
– The User Profile
– The Nature of the Content Your Site Offers
– The Telecommunications Link
Scalability refers to the ability of a site to
increase in size as demand warrants.
• Scale Hardware Vertically
scale your site vertically by upgrading the servers
from a single processor to multiple processors.
• Scale Hardware Horizontally
involves adding multiple single processor servers
to your site and balancing the load among the
servers.
• Improve the Process Architecture of the Site
a combination of vertical and horizontal scaling,
combined with artful design decisions.
Other E-commerce Site Tools
