A1. Introduction to Information Processing
Learning Outcomes:
- Define Information Age and discuss the importance of information literacy in a knowledge-based society.
- How the development of technologies leads to the emergence of the Information Age, and how information can be flexibly and analytically converted into knowledge in modern society should be discussed
Information age
Large amount of information available in the internet.
Individuals have instant access to information.
Information can be flexibly and analytically converted into
knowledge.
è
Knowledge-based
society
References:
https://www.igi-global.com/dictionary/information-age/14305
A2. Data Organisation and Data Control
Learning Outcomes:
- Identify data, records, fields, files and databases in the hierarchical organisation of data.
- Explain how records can be organised, stored and retrieved. State the advantages, disadvantages and applications of the two types of file access: direct access and sequential access.
- Discuss the needs of data control.
- Describe how errors can be detected by using validation and parity checking, and prevented by verification and validation
File organisation
- Organize by name or date with good folder structure.
File access
- Sequential access: e.g. magnetic tape. Data access starts from the beginning until the required information is found or till the end. Used for backup purpose as fast data access not important.
- Direct access: e.g. Hard disk. Data access is almost instant. No need to start searching from the beginning.
Error
- Error detection
- Validation: see below
- Parity check: parity bit added to a data. E.g. 1100001, a parity bit can be added such that the sum of all digits are even number. i.e. 11000011
- Error prevention
- Validation: see below, data rejected will not be used
- Verification:
check if the data entered is the same as the source document e.g. double entry
(such as enter password twice), check by another person
- Data Validation
- Check whether the input data follows the pre-set rules. E.g. data type, range of integers allowed, format of the string, range of the date entered, parity check. Users will usually be prompted to re-enter the data that confines to the rules.
Relevant past paper:
DSE ICT Paper 1B(SP-2017): SP 5bi. PP 5a. 2014 1a. 2015
2aii, 5dii. 2016 1d. 2017 4b.
References:
https://www.ictlounge.com/html/serial_and_direct_data_access.htm
https://www.safe.com/what-is/data-validation/
https://www.precisely.com/blog/data-quality/data-validation-vs-data-verification
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