Download - Building Information System
-
8/8/2019 Building Information System
1/27
BUILDING INFORMATION
SYSTEM
Satinder Kaur
Faculty in Management
-
8/8/2019 Building Information System
2/27
System as Planned Organizational
Change Building a new Information System is a
Planned organizational change.
It is much more than a new hardware andsoftware.
It involves changes in jobs, skills, management
& organization.
-
8/8/2019 Building Information System
3/27
System Development & Organizational
ChangeFour types of structural changes enabled by IT
1. Automation
2. Rationalization3. Reengineering
4. Paradigm Shifts
-
8/8/2019 Building Information System
4/27
-
8/8/2019 Building Information System
5/27
System Development
Systems Developments is a structured kind ofproblem solving with distinct activities.
These Activities consist of
System Analysis System Design
System Development Process Programming
Testing
Conversion
Production & Maintenance
-
8/8/2019 Building Information System
6/27
System Analysis
System analysis is the analysis of the problem thatorganization try to solve with information system.It consist of-
Defining the problem
Identifying the causes Specifying the solution
Identifying the information requirement
System analyst create the road map of the existing
organization systems, identify the problem andthen suggest alternative solutions . It also includefeasibility study about the feasibility of solutiontechnically, financially and at organization level.
-
8/8/2019 Building Information System
7/27
System Design
System design is the overall plan or model for
the new system. It is like the blueprint of
building.
It consist of all the specifications that will
deliver the functions identified during system
analysis.
-
8/8/2019 Building Information System
8/27
System Development Process
Programming
During programming stage, system
specifications that were prepared during the
design stage are translated into software
programme code.
Also, if the software that meets the
requirements for the new system from
external source can be purchased.
-
8/8/2019 Building Information System
9/27
System Development Process
Testing
-
8/8/2019 Building Information System
10/27
System Development Process
Conversion
-
8/8/2019 Building Information System
11/27
System Development Process
Production & Maintenance
-
8/8/2019 Building Information System
12/27
System Designing Methodologies
Structured Methodology
Object Oriented Methodology
-
8/8/2019 Building Information System
13/27
Structured Methodology
It is step by step approach with each step buildingon the previous one.
It is top down ,progressing from highest, mostabstract level to the lowest level of the detail.
It is process oriented focusing on modeling the
processes or actions that capture store,manipulate and distribute data as the data flowthrough a system.
-
8/8/2019 Building Information System
14/27
Process Model
A process is a business activity which when
executed produces certain outputs from given
inputs
The function(s) performed by a process may be
complex, with multiple inputs, outputs and users
The entire application itself is a process
We use successive decomposition into subprocesses to reveal greater details of the
processing
-
8/8/2019 Building Information System
15/27
Decomposition splits the task into subtasks;
subtasks together make-up the parent task;
Balanced decomposition: sub-tasks areroughly equal in complexity
Function Decomposition
-
8/8/2019 Building Information System
16/27
Function Decomposition
Top-down decomposition gives hierarchical
structure
Decompose into 2 or more; not more than 5 A high cohesion (high independence) and
minimum coupling (minimum
interdependence) are fundamental criteria
Continue decomposition until elementary
processes are identified
-
8/8/2019 Building Information System
17/27
Function Decomposition
Elementary process is a smallest unit of
activity meaningful to end user (it sees and
leaves data in consistent state)
Process decomposition diagram
A tree structure
Elementary processes are leaf nodes
Data are not shown
-
8/8/2019 Building Information System
18/27
Function Decomposition
Use proper naming of processes
Business functions named as nouns
(marketing, Inventory control, ) Process name consists of an active verb and
an object (accept order, calculate interest, )
-
8/8/2019 Building Information System
19/27
Data Flow Diagram (DFD)
Very popular tool for describing functions of a
system in terms of processes and data used by
them
DFDs are simple pictorial representations;
easily understood by users and management.
-
8/8/2019 Building Information System
20/27
Data Flow Diagrams (DFD)
DFDs are unambiguous and concise
They can describe processing at physical as
well as logical levels DFDs facilitate top-down development
They permit outlining of preferences and
scope
-
8/8/2019 Building Information System
21/27
DFD Notation
Data Flow : labeled arrow
Sources and sinks of information/data (also called external entity)
Process
or
Available data (data store)
nor
or
-
8/8/2019 Building Information System
22/27
-
8/8/2019 Building Information System
23/27
DFD Example 2: Old Car Mart Buys and sells old cars; has large number in
stock: different models, make, year, colors,
Does some repairs for adding value; records
kept; has own garage
Advertise in news papers
Salesmen hired on commission basis to
handle customers, negotiate, etc.
Needs to take stocks; prepare summary of
sales, profits, etc; pay salesmen
-
8/8/2019 Building Information System
24/27
-
8/8/2019 Building Information System
25/27
Example 3: Book Supplier Supplies books to customers; no stocks
maintained; books sourced directly from
publishers Prepare context diagrams
(all inputs/output not shown, such as invoices,..
-
8/8/2019 Building Information System
26/27
Book-Supplier : Refinement 1
-
8/8/2019 Building Information System
27/27
Book Supplier: Exploding Process 2