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Data ModelFriday, April 29, 2011 | 0 Superman(s)
WHEN I SEE THE 20PAGE ISORG NOTES I HAVE TO MEMORISE, I FEEL LIKE CRYING T.TAnd I took like, 45mins? for a page and a half. sigh. then now its raining like SUPER heavily. take a break! (: revise here.
Study of info systems based on the assumption that info systems are socio-tecnical in nature. Although they are social-technical, there is no such model that satisfies all aspects. All problems tend to be bias towards either the technical, cognitive or behavioural aspect.
Technical aspect gives rise to Data Model. Emphasizes on best practices, accuracy and technical issues. Main area of focus is computer sciences, management sciences and operational research. Emphasizes on mathematically based models ( approaches design from a purely technical angle )
Objectives of Data Model. (3)
- analyse all data in organisation
- determine best way to capture, produce and process data
- determine the most efficent process to produce all the necessary information
Main Characteristics. (3)
- data centric (centers around data)
- centers around WHAT and HOW data is produced and processed. WHY is left to BPR
- tends to ignore behavioural and cognitive aspects of organisation (existing rules and norms)
Role of System Analysts. (3)
- analyse all data in organisation that is readily available and accessible to them
- set new rules and regulations as require
- incorporate data model into database
Data Model. (3)
- highly transparent. not subjected to personal view and bias
- not dependent on users of information systems
- ALWAYS CANNOT REMEMBER THIS POINT! >.<
WHY recommend DM (4)
- urgent need of new IS
- low cost and fast development
- problem bears characteristics of technical bias
- prior BPR conducted
WHEN recommend DM (3)
- urgent need of new IS
- low budget
- low level of co-operation within employees
Advantages of DM
- fast development
- Tabula Rasa : start from clean slate. no specific starting point. start as soon as possible. higher productivity
- Raison D'etre: design proceeds with minimum involvement from end users
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BPR: Business Process Re-engineering
Gets rid of "cow-path" and unwanted processes
VCR: Value Chain Redesign
Adds value to another process with this process (link all together, adds value to one another)
Example of DM : ERP, attendance taking system
Cognitive aspect: Gives rise to Decision Making Model
DMM- study of how decision makers percieve and use information to make decisions
(socio-psychological aspect)
Behavioural aspect: Gives rise to Transaction cost model
TCM- study of how economic and social factors are influenced by the long term development and maintenance of information systems
(economic and sociological aspect)
4 processes (SCRM)
- Search
- Contract
- Regulation
- Maintainence
Gives rise to frictions (BOUFAS)
- Bounded Rationality (wide range of choices, limited to past experiences and advices from others)
- Opportunism (people may act in the interests of themselves rather than the company)
- Uncertainty (finance, economic, laws, political etc)
- Frequency (high frequency, higher chance of internalisation, but will give rise to whole new set of problems eg. agency costs)
- Asset Specificity (GM&Fisher case)
- Small Numbers (close to monopolistic market. small increase in price, dont lose customers, high increase in profit. eg. MRT, NETS)
Examples of TCM: SCM(supply chain management)
YES THATS ALL I STUDIED TILL NOW! ): HELPPPPPPPPPPPPP
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Data Model