This level is a decomposition of a process shown in a level-1 diagram, as such there should be a level-2 diagram for each and every process shown in a level-1 diagram. In this processes 2.1 & 2.2 are children of process 2. Together they wholly and completely describe process 2, and combined must perform the full capacity of this parent process.
As before, a level-2 diagram must be balanced with its parent-1 diagram.

From the diagram above process 2.1 has dataflows from a customer -‘payment’ and from process 1 ‘make a reservation’. The dataflow ‘payment’ has the payment method from a customer to process 2.1 then process 2.1 has to confirm the payment.
Process 1 will send reservation details via dataflow ‘reservation slip’ to process 2.1, then will match up reservation details with payment details. If payment ok, confirmed reservation details will be sent to process 6 for completion, and reservation records be sent to or saved in a datastore D2.1. Else if there is an error, the ‘make refund’ process 2.2 will retrieve a reservation record from datastore D2.1 and either make a refund to a customer or arrange for alternative reservation which is dealt in process 4 ‘passenger care’.

LEVEL 1 DFD

Here is my level DFD done for LSBU AIRLINES




Description of Level 1 Data Flow Diagram DFD
A Dataflow diagram is a graphical representation of the flow of data through an information system, can also be used for the visualization of data processing.
The level 1 DFD shows how the system is divided into subsystems (Processes), each of which deals with one or more of the data flows to or from an external agent , and which together provide all the functionality of the system as a whole. It also identifies internal data stores that must be present in order for the system to do its job and show the flow of data between the various parts of the system.
A physical DFD’s represent physical files and transactions while a logical or conceptual DFD can be used to represent business functions or processes.
DFD’s can be of existing system or can describe the requirements for a proposed or planned system. A DFD of an existing system should represent the functions and processes that are already in place. A required system DFD is a diagram of a system that will be implemented in the place of the current one.

LSBU Airlines

LSBU Airlines

Ok guys am back.
First to tell you that I need to analyze this scenario by using diagramming technique for depicting how a system works. Right now I am preparing a Context diagram and DFD-Data flow diagram. Once finished I will upload them for you to see.

LSBU Airlines

Now I am involved in a team of Information System Analysts to Improve LSBU Airlines poor and old system.

LSBU Airlines is a low cost regional carrier that operates primarily in the European Union. At the present time, LSBU Airlines operates its own part manual and part computer based reservation information system.

All reservations on LSBU Airlines flights are placed through LSBU’s own regional reservation offices. Flights are not booked through other travel agents and LSBU Airlines does not participate in industry-wide reservation services at present.

Despite LSBU’s best efforts at processing passenger reservations... sometimes double bookings occur: such as two passengers being booked into the same seat on the same flight on the same day. In such cases LSBU‘s central administrative officers pass the details of the double booked reservations on to an LSBU Passenger Care Advisor who will contact (usually phone) the passenger(s) affected and attempt to make alternative flight reservations or offer a refund where alternatives cannot be found. In the event of a refund a credit/debit card is required; cash refunds are not given but are instead paid by bank transfer to the bank account or credit/debit card of the passenger’s choice.

TO CUT THE STORY SHORT LSBU AIRLINES SYSTEM IS A COMPLETE MESS AT THE MOMENT.
My later posts will show you how my team will build their new system under my supervision as a Project Manager.

System Analysis Techniques

In my later posts I will be reflecting on System Analysis Techniques. I came across few case studies and been assigned to some companies to help with their systems.

Database Architecture

Database Architecture I have designed for SQ & S sixteen offices. Offices linked together by a WAN. The whole network linked to common data centre based at the head office.
The system will also back up data automatically and be saved in any of their other offices than in the head office.
I have chosen the single Server because of the size of the business and also considered geographical size.
The WAN will be required to connect the server LANs in all 16 offices, Head office and data centre. This Architecture requires sufficient WAN capacity to carry database traffic from all locations.

Sorry I couldn't upload a formal report but I have presented it to SQ&S;

The organisation is facing problems with managing their materials. Material that is out of date is not being removed or update, the number of broken links is rising and search engines are becoming less effective. Senior management have decided that money, time and effort must be spent to resolve the problem, but a dispute has broken out over the best solution, arguing which is better in long run – Content Management System or Enterprise Wiki.


I have advised them to use CMS over wiki simply because of the advantages.

Today I am preparing a formal report of the System requirements for SQS and will publish it on my later posts.

Content Management System (CMS) is a system or software used to manage the content of a website, or a collection of procedures used to manage workflow in a collaborative environment.

CMS consists of two elements: Constant Management Application (CMA) and Content Delivery Application (CDA). CMA allows the content manager who may not know HTML to manage the creation, modification and removal of content from website. The CDA element uses and compiles that information to update the website.

Advantages:

I have just learned about CMA element within CMS, means changes on a website can be made anytime they are needed. All technical details are handled by CMS allowing anyone to manage and update the site.CMS ensures that all pages are consistent in design and will build all menus and other navigation for business.

It is easy to update the site, just point-and-click, type new words and hit save. Changes reflect quicker onto the website. Visitors are more likely to enquire/buy products or service if the website has detailed up to date information.

CMS also automates menial tasks, such as applying the same page layout and appearance across the site.

CMS let webmasters control the content of their website from the comfort of their own operating system. All the information stored on the website is also stored on the hard drive; making it simple to access the websites content even without an internet connection.

CMS’s comes with an administrative interface that allows webmasters to add content automatically throughout the entire website. Furthermore, CMS allows webmasters to test various templates without changing the content of the website.

Another useful feature included with a good content management system is Really Simple Syndication (RSS). RSS feeds let the website’s visitors receive daily feeds of the content that is published.

After careful consideration I advized SQ & S to use CMS.

Integrated Assignment

I have been asked by CCL to solve their software problem.
So much problems but they are thinking of using either CMS or Enterprise Wikki.

I am here as an expert to solve their problem and I will let you know in My later posts how I'm gonna resolve these problems and also suggests the best system for them.

Two concepts used to begin defining System requiremets

First we need to create models. I can define a model as a reflection of the actual system plan before it is built, can be done theoretically or physically.

In this case of System requirements we need to develop two types of System Models,

1)A logical Model- shows what the system is required to do without committing to any technology.

2)A physical Model-this shows how the system will actually be implemented.

The role of system analysis

As a Business IT student, always asked myself what role the analyst will play in a Business. After few studies I discovered that System Analysis activities focus around the translation of the business requirements into systems requirements. Business requirements have to be analyzed and decomposed into a series of smaller requirements for different components, providing directions for the engineering team.

This statement now will make me understand the role of a System Analyst.