System Analysis 101
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System analysis, the definition you don’t know … Yet!!
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Introduction to the real practical defintion of system analysis, and what are the essential step to start up your career as ana analyst
Transcript of System Analysis 101
System analysis, the definition you don’t know … Yet!!
“Dive into real life”
What is Analysis ? Really
What, Why and Why not?
Hands on Example
OOP, The thing they don’t teach you @ School.
How to be an Analyst ?
Muhammed Nabil
System Analyst
+6 Years
B.Sc. in Computer Science
M.Sc. in Information system
What is system analysis ?
To know that!!
What is a System ?!
Isn’t That old ?!!!
An information system (IS) is an arrangement of people data, processes, and information technology that interact to collect, process, store, and provide as output the information needed to support an organization.
Yes People
WAllahEl
People
Client
Stakeholders
Developers
End UsersPM
QE/A
12.8%
12.3%
Incomplete Requirements
7.5%
Lack of Executive Support
11.8%
15.9%
13.9%
13%
* THE STANDISH GROUP REPORT 2007
44.4%
42.8%
Yea Yea they are people
What is system analysis ?
Analyzing people needs
Basics of Object Oriented Programming
Inheritance
Abstraction
Encapsulation
Polymorphism
Responsibilities…
Knowing
Doing
Where are we going ?
Impact and Gap analysis
Responsibilities…
What, Why and Why not?
Solution View
Static
Dynamic
Functional
Functional View
Static View
Dynamic View
“80% of your object modeling needs can be satisfied with 20% of the notation”
- Scott Ambler
What Should I use ?
Hands on Example
A woman without her man is nothing
A woman without her. Man is nothing
A woman, without her man is nothing
What is a Feature ?
“A condition or capability to which a system must
conform”
Q: Is features enough ?!
A: Yes ..
When you are a Tailor
What is a Use Case?
“A sequence of actions a system performs that yields an
observable result of value to a particular actor. ”
Use Case contain :Use Case Name
Brief Description
Flow of Events • Basic Flow
• Sub-Flows
• Alternative flow
Special Requirements
Precondition
Post condition
Extension point
Alternative :
“Necessitating a choice between mutually
exclusive possibilities” Webster
Extension:
“Act of expanding in scope; making
more widely available “
Webster
Example
Withdraw Features
• A withdrawal transaction asks the customer to choose a type of account to withdraw from (e.g. checking) from a menu of possible accounts, and to choose a dollar amount from a menu of possible amounts. The system verifies that it has sufficient money on hand to satisfy the request before sending the transaction to the bank. (If not, the customer is informed and asked to enter a different amount.) If the transaction is approved by the bank, the appropriate amount of cash is dispensed by the machine before it issues a receipt. (The dispensing of cash is also recorded in the ATM's log.)
• A withdrawal transaction can be cancelled by the customer pressing the Cancel key any time prior to choosing the dollar amount.
Give it a try ?!!
Use Case Name Withdraw amount
Use Case ID WA-01
Trigger Customer selects to withdraw money
Precondition The user is identified as authenticated through his PIN number
Basic Flow 1. System displays available accounts type according to the customer ID.
2. Customer select specific accounts.3. System displays default amounts.4. Customer select specific amount.5. System verifies the ATM has sufficient money.6. System verifies with the bank that the account has sufficient
money.7. System approve transaction, dispense amount8. Customer retrieve amount and Card9. System generate receipt.
Alternative Flow 5.1 ATM doesn’t have enough money, display message and go to step 46.1 Customer balance not enough, display message and go to step 48.1 Customer didn’t retrieve card and money on time, Hold the card and the amount and display message and produce receipt
Post condition Transaction status recoded in the system
How to be an Analyst ?
Problem solver
Programming experience
Excellent communication Skills
Self-starter
UML+
Documentation skills
Analytical Skills
Questions ?
