Interview Questions for Business Analysts and Systems Analysts


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INTERVIEW QUESTION:

What is OOAD?

ANSWER

The acronym OOAD stands for Object Oriented Analysis and Design.  OOAD is a software engineering approach that models and designs a system as a group of interacting objects. Object is the term used to describe some entity or “thing” of interest.  These objects are typically modeled after real world entities or concepts.  For the business analyst, these would be the real-world entities that arise within the business (invoice, product, contract, etc).

Objects have attributes which can be set to specific values. This defines the state of the object.  Objects also have methods or functions which define their behavior.

Here is a quick example for illustrative purposes.  Consider the real world object “Car”.  Our car has attributes that can be defined with specific values such as,
  • make = ford
  • model = escape
  • year = 2002
  • color = green
  • maximum speed = 130 mph
  • current speed = 50 mph
  • ideal tire pressure = 35 psi
  • current tire pressure = 31 psi
  • remaining fuel = 12 gallons
Each of these attributes define the “state” of the vehicle.  They describe the car as it is at some point in time.  Additionally, the car has certain “behaviors” such as
  • accelerate ()
  • decelerate ()
  • refuel ()
  • fill tires ()
Each of these behaviors of the real world object can be represented as a method of the object when designing the system (methods are also known as a functions in some programming languages).  These methods can change the values of the attributes causing a change in state.

OOAD is comprised of two parts:
(1) object oriented analysis
(2) object oriented design

Models of different types can be created to reflect the static structure, dynamic behavior, and run-time deployment of the collaborating objects of a system.  

During the object-oriented analysis (OOA) phase object-modeling techniques are used to analyze the functional requirements for a system and create models which reflect the logical design of the system.  During the object-oriented design (OOD) phase of the system, models are elaborated upon to include implementation specific details that show how the physical design of the system will come together.  OOA focuses on what the system does (its static structure and behavior), OOD on how the system does it (it’s run-time implementation).
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ADDITIONAL ANSWERS / COMMENTS

Ajinkya Raut posted on Sunday, April 20, 2014 10:58 AM
Very good and predictable answer to satisfy the basic responsibilities of BA
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Do your homework prior to the business analysis interview!

Having an idea of the type of questions you might be asked during a business analyst interview will not only give you confidence but it will also help you to formulate your thoughts and to be better prepared to answer the interview questions you might get during the interview for a business analyst position.  Of course, just memorizing a list of business analyst interview questions will not make you a great business analyst but it might just help you get that next job.





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