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NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
SEPTEMBER 2020 EXAMINATION

COURSE CODE: CIT703

COURSE CREDIT: 3

COURSE TITLE: INFORMATION TECHNOLOGY AND SOFTWARE DEVELOPMENT

ALLOWED: 21 /2 HOURS

INSTRUCTION: ANSWER QUESTION ONE (1) AND ANY OTHER (4) QUESTIONS

 

Question 1 (22 marks) Compulsory

(a) State the four (4) levels of software testing. (2 marks)

(b) Briefly describe functional testing and analysis. (3 marks)

(c) Based on Leyman and Belady descriptive model of software evolution, identify and briefly describe three properties that characterize the evolution of large software systems (3 marks)

(d) Outline the advantages of Decomposition in data flow diagram. (4 marks)

(e) explain the four (4) basic mapping cardinalities. (4 marks)

(f) explain any three (3) of the characteristics of a good software requirement specification as stipulated by IEEE. (3 marks)

(g) Briefly discuss how communication would serve as control for a project. (3 marks)

 

Question 2 (12 marks)

(a) In what way is application generation different from assembling reusable components (4 marks)

(b) Describe the indicators to consider in determining whether to continue maintaining a system or re-build it entirely? (3 marks)

(c) In what way is software process model related to software life cycle model? (5 marks)

 

Question 3 (12 marks)

(a) Why is maintenance considered an important aspect of software development process? (4 marks)

(b) Describe what you understand by these three software process models (6 marks)

i. workflow model

ii. data-flow model

iii. role model

(c) It has been argued that UML model goes beyond the set of diagrams of a system, substantiate this argument. (2 marks)

 

Question 4 (12 marks)

(a) Discuss the reasons behind the development of objectional model in database technology (3 marks)

(b) Discuss two features among those commonly offered by current Database Management Systems (4 marks)

(c) The diagram 1 below represents a particular process in a data flow diagram, identify and summarize the meaning of each alphabet. (5 marks)

Question 5 (12 marks)

(a) Appraise three (3) usefulness of physical flows in data flow diagram. (3 marks)
(b) Describe the following concepts in entity relationship diagram. (4 marks)

(i) entity

(ii) relationship

(c) What is mapping cardinality? (2 marks)

(d) Explain the major benefits of extreme programming. (3marks)

 

Question 6 (12 marks)

(a) Discuss entity relationship modelling. (5 marks)

(b) Briefly describe requirement engineering. (3 marks)

(c) Discuss the coding phase of extreme programming. (4 marks)


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