MIS (Module Interface Specification)

Question 1

Define the MIS

Answer 1

A blackbox description of a module. Contains no information about the insides of the module or its access routines. Internal aspects are secrets.

Supports: Designer, Developer, Tester, User

Question 2

What does the MIS for each module consist of

Answer 2

• Syntax (tabular), - Semantics (state variables, environment variables, assumptions and considerations.)

Question 3

Define a “set” routine in MIS

Answer 3

Transition: specifies state transition, new value in terms of old values.
Exceptions: Conditions for raising an exception.

Question 4

Define a “get” routine in MIS

Answer 4

Output: Specifies the return value.
Exceptions: Conditions for raising an exception.

Question 5

Define a “get-set” routine in MIS

Answer 5

Transition-Output: specifies the transition and the output

Exceptions: Conditions for raising an exception.

Question 6

Define environment variables

Answer 6

Interact with the environment or other modules. Can include; a keyboard, screen, file system…

Question 7

What type of external interaction is described in the MIS?

Answer 7

Any passive interactions, like OS memory calls.

What appears:

• Naming access programs of other modules
• Specifying how other modules state variables are changed.
• Identifies what external modules are used.

Question 8

What is a PERT chart

Answer 8

Program Evaluation and Review Technique.

Shows a logical sequence of tasks, where a task may be dependent on other to start.

Can be drawn using a tool like GANTT chart

Question 9

What is the critical path in a PERT chart?

Answer 9

The shortest time in which a project can be completed.

Question 10

What is the Slack time in a PERT chart?

Answer 10

The time for which an activity can be delayed without delaying the project.

Question 11

What is the equation for estimating task duration?

Answer 11

ET = (o + 4r + p) / 6

ET - is estimated time
o - optimistic estimate
p - pessimistic estimate
r - realistic estimate