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- Chapter 12
- Information Systems Management In Practice 5E
- McNurlin & Sprague
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- Systems that support, not replace, managers in their decision-making
activities
- Decision modeling, decision theory, and decision analysis, attempt to
make models from which the “best decision can be derived, by computation
- DSS is defined as: Computer-based systems
- That help decision makers
- Confront ill-structured problems
- Through direct interaction
- With data and analysis models
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- DDM Paradigm is the interaction of
- Dialog (D) between the user and the system
- Data (D) that support the system
- Models (M) that provide the analysis capabilities
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- A good DSS should have a balance among the three capabilities:
- Easy to use to support interaction with non-tech users
- Access to wide variety (4 types) of information sources
- Provide analysis and modeling in a variety of ways
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- The attributes of the dialog components can be called a “dialog style”
- Reference card
- Mouse to access pull-down menus
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- Data sources
- Data warehousing
- Data mining
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- Models provide the analysis capabilities for a DSS. Using a mathematical representation of
the problem, algorithmic processes are employed to generate information
to support decision making.
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- Institutional DSS: Intended for organizational support on a continuing
basis,written using a DS language. Typically mainframe, now PC-based
- For Marketing Analysis (e.g., Ore-Ida): Support three main tasks in
decision-making process:
- Data retrieval - help manager answer “What has happened?”
- Market analysis - answer question “Why did it happen?”
- Modeling - helps manager answer “What will happen if…?”
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- Institutional DSS: (cont.)
- For Sales Forecasting (e.g., Sara-Lee):
- Previously sales forecasts came from sales force - were too
optimistic, inventories were excessive.
- Then time-series analysis of historical data was used, did not handle
impact of sales promotions well.
- Now companies use multiple regression models in order to inject
“explanatory variables” into analysis of historical data - and
therefore into the forecasts
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- Quick hit DSS: Means a system that is quite limited in scope, is
developed and put into use quickly, and helps a manager come to a
decision fast. Can be useful for:
- Getting managers started in using DSS
- Providing DS for certain types of management decisions on an ad hoc or
recurring basis
- Providing a basis for deciding whether or not to build a full DSS
- For supporting decision situations where the executives cannot wait for
a full DSS to be built
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- Quick hit DSS (cont.) - types:
- Reporting DSS: Select, summarize, and list data from existing data
files to meet manager's specific info needs
- Short Analysis program: Analyze data as well as print or display the
data. Generally use a small amount of data, which can be entered
manually, e.g., impact of ESOP
- DSS generators: Provide a way to develop quick,high - payoff DSS.
Include languages, interfaces, and other facilities that aid in setting
up specific DSS within a class of decision support applications
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- PC-based DSS has continued to grow.
Spreadsheets encompass some of the functions previously performed
by DSS generators.
- Group DSS to support interdependent group decisions
- Focused versions targeted at specific users
- DSS groups as support teams for variety of other types of user support
- User friendly capabilities
- DSS refers mostly to systems for analysis of complex situations, having
absorbed most of the work of management science and operations research
in business organizations
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- Data warehouse: Houses data used to make decisions. This data is obtained periodically
from transaction databases. The warehouse provides a snapshot of a
situation at a specific time.
Data warehouses differ from operational databases in that they do
not house data used to process daily transactions. Operational databases have the latest
data.
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- Key Concepts:
- Metadata: The part of the warehouse that defines the data. Metadata means “data about data.”
Metadata explains the meaning of each data element, how each element
relates to each other, etc.
- Quality data: Is the cleaning process
- Data marts: Is a subset of data pulled off the warehouse for a specific
group of users
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- Give people new insights into data
- Uncover unknown similarities, correlations that exist within one
customer group that differentiates them from other groups
- Is an advanced use of data warehouses, and it requires huge amounts of
detailed data
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- ESS:
- Company performance data: sales, production, earnings, budgets, and
forecasts
- Internal communications: personal correspondence, reports, and meetings
- Environmental scanning: for news on government regulations, competition,
financial and economics developments, and scientific subjects
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- EIS is a DSS that provides access to (mostly) summary performance data,
- using sophisticated graphics to display and visualize that data,
- in a very easy to use fashion,
- and with a minimum of analysis for modeling beyond the capability to
“drill down” in summary data to examine components.
- ESS adds communications and environmental scanning.
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- Lack of executive support -
executives must provide the funding, but are the principal users
and supply the needed continuity
- Undefined system objectives - the technology, the convenience, and the
power of EIS are impressive, but the underlying objectives and business
values of an EIS must be carefully thought through
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- Poorly defined information requirements: EIS typically need non -
traditional information sources - judgments, opinion, external
text-based documents - in addition to traditional financial and
operating data.
- Inadequate support staff: support staff must have technical competence,
understand the business, and ability to relate executives, and be a
permanent team to manage evolution of systems
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- Poorly planned evolution: highly competent system professionals using
the wrong development process will fail with EIS; EIS are not developed,
delivered, and then maintained. They should evolve over a period of time
under the leadership of a team that includes the executive sponsor, the
operating sponsor, executive users, the EIS support staff manager, and
the IS technical staff
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- Attack a critical business need: EIS can be viewed as an aid to dealing
with important needs that involve the future health of the organization
- A strong personal desire by the executive: The executive sponsoring the
project may want to get information faster than he/she is now getting
it, or have a quicker access to a broader range of information, or have
the ability to select and display only desired information and to probe
for supporting detail, or to see information in graphical form
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- “The thing to do”: An EIS is seen as something that modern management
must have, in order to be current
in management practices. The rationale given is that the EIS will
increase executive performance and reduce time that is wasted by such
things as telephone tag.
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- A Status Access System: Filter, extract, and compress a broad range of
up-to-date internal and external information. It should call attention
to variances from plan. It should also monitor and highlight the
critical success factors of the individual executive user. EIS is a structured
reporting system for executive management, providing the executive with
the data and information of choice and desired form.
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- Human Communications Support: This viewpoint sees an EIS in terms of
human communications support that it provides. Manager can call on
“network of help” (peers, subordinates, clients, customers, suppliers,
etc). Manager makes requests, gives instructions, asks questions to
selected members of this network, and acts through communications. EIS supports these communications.
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- Personal computer based DSS: Newer packages
- For the institutional DSS that support sequential interdependent
decision making: Distributed DSS
- For interdependent decision support: Group DSS
- Decision support system products are incorporating tools and techniques
from artificial intelligence
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- Continued efforts to leverage the usefulness of DSS: EIS
- DSS development groups have become less like special project commando
teams and more a part of the end user support team
- Cutting across all the preceding trends is the continued development of
user friendly capabilities: Dialog support, speech recognition
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- Application of technologies to improve the performance of information
workers in organizations, specially dealing with ill-structured
problems.
- Challenges:
- Integrated architecture: a common interface at the desktop as common
dialog interface to access all IS
- Connectivity: an integrated part of IS
- Document in addition to data
- More intelligence
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