Question

A use case views a system from the perspective of a user.
    a. true
    b. false

When estimating project parameters:
    a. estimates can only be made when estimators have access to performance data from previous projects
    b. estimates are quite accurate in the earliest stage of the project, then gradually decrease in accuracy as the project is executed
    c. estimates are about 20% accurate on high risk projects, and 10% accurate on more routine projects
    d. estimates are quite inaccurate in the earliest stages in the project, then gradually improve as the project is executed

A fundamental precept of RAD Application Development is that:

    a. it is crucially important to control customer changes to requirements
    b. the most effective way of capturing customer requirements is to employ highly skilled business analysts to elicit requirements from customers
    c. the most effective way of capturing customer requirements is to let customers see what they will get

    d. the customer is always right

A use case views a system from the perspective of a user.
    a. true
    b. false

The staged iterative approach to s/w development
    a. produces usable results as early as Iteration 1
    b. focuses on maintaining overall systems integrity through a gradual development process
    c. completely rejects the employment of Waterfall stages when developing s/w
    d. is driven by careful pre-specification of project requirements

Answer 1

1) A use case views a system from the perspective of a user.
Ans: True

Because a use case drafts an illustration of how users will perform tasks on your project's modules functionality.
It abstracts, from a user’s side view, a project's behavior as it react to a request. Each use case is displayed as
a sequence of simple steps, taking into consideration and initiating with a user's goal and terminating when that goal is achieved. Use cases appends value because they facilitates describing how the project should react and in the process, they also help deliver an idea what could go wrong. They shows a list of goals and this list can be used to make the cost and complexity of the system.

2) When estimating project parameters:

Ans: a and b both option

a. estimates can only be made when estimators have access to performance data from previous projects.
Reason:- This can be achieved by comparative estimation. In this, estimates achieved during the previous work performed in previous projects will ensure to step further in handling forthcoming projects.

b. estimates are quite accurate in the earliest stage of the project, then gradually decrease in accuracy as the project is executed
Reason:- This can only happen because of worng implementation of theory and calculations deployed upon the subjected project while execution, as the project didn't adapt according to the desired output. Therefore, the estimates decrease in accuracy as project executed.
  
c. estimates are about 20% accurate on high risk projects, and 10% accurate on more routine projects.
Reason:- It can be achieved only by taking proper care and implementing all the variables and conditions upon the high risk project, where we know the cost implemented upon project and the estimates acquired from the previous projects delivering desired results from the project execution. This reduces in routine projects as here we only encounter those things which an be easily handled during project execution.

d. estimates are quite inaccurate in the earliest stages in the project, then gradually improve as the project is executed.
Reason:- This can't happen for any of the project if that project is guided by an expert who has a visionary approach and has a deep analysis of project view's. So, with help of the estimates and experience of the expert and proper designing of projects module according to prototype, will enable to achieve accurate results upon project execution.

3) A fundamental precept of RAD Application Development is that:
Ans: c. the most effective way of capturing customer requirements is to let customers see what they will get

RAD is Rapid Application Development model.In this model, the components are developed parallelly.The developments are gathered timely and then, delivered and assembled into a working prototype. This can quickly give the customer some idea about product and use it and provides the feedback regarding the product and their requirements. This model encourages customer feedback and provide quick initial reviews.

4) A use case views a system from the perspective of a user.
Ans: True

Because a use case drafts an illustration of how users will perform tasks on your project's modules functionality.
It abstracts, from a user’s side view, a project's behavior as it react to a request. Each use case is displayed as
a sequence of simple steps, taking into consideration and initiating with a user's goal and terminating when that goal is achieved. Use cases appends value because they facilitates describing how the project should react and in the process, they also help deliver an idea what could go wrong. They shows a list of goals and this list can be used to make the cost and complexity of the system.

5) The staged iterative approach to s/w development
Ans: b. focuses on maintaining overall systems integrity through a gradual development process

In iterative model, it does not need to have full specification of requirements at starting.
Instead, development starts with specifying and implementing small part of the software, which can then
be reviewed so that to identify further requirements. This process is then repeated again and again that
result in producing a new version of the software at every stage of model.The first three phases(Requirement, design and implementation) of the iterative model is in fact following waterfall Model of software development.

Answer 2

ANSWERS :

I). TRUE

Use case is related to user.

ii) Option d.

It is quite obvious.

iii) Option b.

Correct capturing of customer is very important for the success of the project.

iv) TRUE 

Use case is related to user.

v)  Option b.

It seems quite obvious.