topic summaries

Question 1

required skills of a business analyst

Answer 1

technique
people
business

Question 2

User goal technique

Answer 2

simple and effective
identify all potential categories of users of the system
interview and ask them to describe the tasks the computer can help them with
go further and refine the tasks into user goals –> i need to, place order, track the order, pay for the order

Question 3

Event decomposition technique

Answer 3

identify events that occur to which the system mush respond

for each event, name a use case (verb-noun) that describes what the system does when the event occurs

Question 4

types of events

Answer 4

external–> outside the system, usually initiated by external agent or actor
temporal –> occurs as a result of reaching a point in time
state –> happens inside the system, trigger some process

Question 5

Parts of an event table

Answer 5

Event 
trigger 
source case 
use case 
response 
destination

Question 6

CRUD analysis

Answer 6

used for validating or refining all possible use cases

to match use cases and data entities (domain classes by including create, read, update and delete)

Question 7

Context diagram

Answer 7

DFD –> summarizes all processing activities for the system or subsystem
Shows system boundaries
System scope is represented by a single process, external agents and all data flows, into and out of the system

Question 8

Rules and guidelines of DFD

Answer 8

1. DFD must have at least one process, and no freestanding objects, or objects connected to themselves
2. a process must receive at least one data flow coming into the process and create at least one data flow leaving the process
3. a data store should be connected to at least one process. it has to have data flows in and data-flows out
4. External Entities should not be connected to each other. Although they communicate independent that communicates is not part of the system we design using DFD’s

Question 9

Evaluating DFD quality

Answer 9

Black holes
Data flow consistency
miracle
balancing

Question 10

Data flow consistency

Answer 10

data outflows need corresponding data inflows

data inflows need corresponding data outflows

Question 11

Black hole

Answer 11

process/datastore with data input where data element is never used to produce data output

Question 12

Miracle

Answer 12

process/datastore where data element created out of nothing

Question 13

balancing

Answer 13

DFD fragments = context diagram

Question 14

Agile development

Answer 14

a guiding philosophy and set of guidelines for developing information systems in an unknown, rapidly changing environment

Question 15

SDLC

Answer 15

framework that identifies all the activities required to research, build, deploy and often maintain an information system

Question 16

predictive approach to SDLC

Answer 16

an approach that assumes the project can be planned in advance and that the new information system can be developed according to plan

Question 17

Waterfall method

Answer 17

SDLC approach that assumes that phases can be completed sequentially with no overlap

Question 18

Adaptive approach

Answer 18

an approach that assumes the project must be more flexible and adapt to changing needs as the project progresses

Question 19

traditional approach

Answer 19

system is a collection of processes
processes interact with data entities
processes accept inputs and produce outputs

Question 20

object oreinted approach

Answer 20

system is a collection of interacting objects
objects interact with people and each other
objects send and respond to messages

Question 21

Domain model class diagram

Answer 21

a class diagram that only includes classes from problem domain

Question 22

Use case diagrams

Answer 22

a graphical UML diagram that summarises information about actors and use cases
shows overview of functional requirements
can have multiple use case diagrams
- by subsystem
- by actors

Question 23

automation boundary

Answer 23

the boundary between the computerized proportion of the application and the users who operate the application

Question 24

activity diagram

Answer 24

create off of the flow activities

Question 25

system sequence diagram

Answer 25

shows the inputs and outputs for each use case as messages

Question 26

use case description

Answer 26

• a textual model that lists and describes the processing details for a use case case. it provides details of preconditions, post conditions, sequence of activities and exception conditions in use case
• describes actor interacting with computer system step by step to carry out business activity
• may have several scenarios for a use case, each a specific use case instance

Question 27

functional requirements

Answer 27

the activities the system must perform to support the users work

Question 28

non-functional requirements

Answer 28

required system characteristics other than the activities it must perform or support

Question 29

Stakeholder

Answer 29

person who have an interest in the successful implementation of the system

Question 30

internal stakeholder

Answer 30

persons within the organisation who interact with the system or have a significant interest in its operations and success

Question 31

external stakeholder

Answer 31

persons outside the organisation control and influence who interact the system or have a significant interest in it operations or success

Question 32

operation stakeholder

Answer 32

persons who regularly interact with a system in the course of their jobs or lives

Question 33

executive stakeholder

Answer 33

persons who don’t interact directly with the system but who either use information produced by the system or have significant financial or other interest in its operations and success

Question 34

fact finding methods

Answer 34

reviewing reports, forms, procedures manuals 
interviewing 
observation prototyping 
questionnaires 
JAD 
vendor solutions