Fourth Quiz
Commencement Monitoring, Analysis Requirement
Concept of System Investigation
- Gap between system purpose and the real conditions of system
- Detection problem statement is not real:
- The system purpose is too ideal
- Less of resource or attitude
- System measurement is not accurate
- Using Out of date system purpose
- Different between idle system and temporary system.
- Define the running system investigation with details specified
- Obtain the consensus of ideal system
- Developing several alternatives
- Selecting the best alternative
- The investigation purpose show problem that occurred.
Constraints on investigation system:
When we doing the investigation, there are several constraints that are appear, such as:
- Time
- Cost
- Knowledge
- Politic
- Involved
Recommendation
The result of investigation is a recommendation that includes:
- Take no action because the problem is not found
- Doing system maintenance there are small problems
- Increase the user ability or user skill
- Consider about modify system totally
Settle the occurred problem into system development planning.
Investigation tactic
§ Why we need tactic for?
§ To find whole problem
§ To know the problem motive
§ To find the proper solution
§ It’s doing to make all of system element can accept the solution without annoy their activities.
§ Several Tactics that we can doing:
§ Listen to the opinion of system subject.
§ Don’t give the beginning of problem solving
§ Consider
§ Care about inconsistency logical problem
§ Direct :
§ Questionnaire
§ Answer and Question
§ Observation
§ Indirect :
§ Current procedure
§ Document learning
§ Sample
§ Tabular
§ Input
§ Output
§ File
§ Data Element
§ Volume of Transaction and action document
§ Data flow diagram
Analysis Requirement
Intensive interaction between system analyst and end user where system development team show their ability to get conception and user believe until we get best participation.
§ Four purposes which want to attain:
§ Explain the ideal system information
§ Encourage
§ Method
§ Answer and Question
§ Questionnaire
§ Observation
§ Analysis Procedure
§ Document observation
§ Resource constraint
§ Time
§ Money
§ Skill
§ Technology
§ External Factor
§ Analysis requirement document
§ Analysis Directive: relation with end user, process observation, problem in collect data.
§ User Requirement: Real requirement, statement requirement, training requirement and influence of new system.
§ System constraint: roll out consider of time and cost, skill, technology and external factor.
§ Document in the form of data collected, statistic consensus, logically and physically data flow, current data element in data set.
Generating System Alternatives
How to make the current system is like ideal system?
§ Make alternative to solve the information system problem
§ Applying the best alternative prudently
Strategy selection
§ Distributed versus centralized processing
The change of information decision from centralized data processing into decentralized end user responsibility center
§ Integrated versus dispersed database
System designer have to consider what the data that be included into data base and the data that be included into File.
§ Surround Strategy of System Development
Surroundings of strategy are important in business take over because information system from other business may different with current business.
§ Tactics Selection
Doing before operational design selection:
§ Operational design selection
Design selection could be categorized into:
§ Input
§ Online Vs Off Line Data Entry
§ Keyed Vs Machine Readable Data Entry
§ Centralized Vs Decentralized Data Entry
§ Processing
§ Batch Vs real time record update
§ Sequential Vs Direct Access to records
§ Single Vs Multiple User update of records
§ Output
§ Traditional Vs Turn Around Documents
§ Structured Vs Inquiry based reports
Selecting the Proper System
§ Consider tactics: system compared by cost and profit relatively. Three methods to say A system more excellent than other system are :
- A have a cost more inferior than B and the profit of both are same
- A have a cost more inferior than B and A result profit is more much than B.
- A and B have a some cost but A's profit is more much
§ System comparison methods :
§ Break Even point Analysis
§ Payback Period
§ Discounted Pay Back period
§ Internal Rate of Return
§ Cost categories
§ Hardware
§ Software
§ People
§ Supplier
§ Telecommunications
§ Physical sites
§ Cost detailed:
Compare information system cost by system live, analyst forecasting the change of cost for future and there are three information system models, include: Linear, Exponential, and Step function.
§ Information System cost can happen in once and continuous.
§ Onetime cost is Information system cost that happens once and development cost that happen when system is developing.
§ Information system that happen continuously such as recurring cost and operational cost where this cost happen if information system is operated every day.
Information system Factor:
Qualitative factor that aim proper information system outcome are:
§ Fault decrease
§ Decrease the time for fault repair
§ Decrease perceptive time of alternative workstation
§ To Increase system security
§ To Increase the update of source of active record.
§ To Increase user satisfied
Business strategy factor
§ Consumer satisfied
§ The selling level raise
§ Consumer and vendor commitment
§ Information of Product Marketing
Presentation System Learning
§ Doing concise presentation
§ Decrease elaboration technique in presentation
§ Use visual auxiliary to define explicitly.
§ To make informative presentation, used auxiliary especially if we presentation with model.
§ Pressure the benefit of information system proposal with several alternative appropriate business conditions.
Decision to continue or not
§ If business makes a decision to develop the system, then information department will do the next process that is System Design Process.
§ In contrast, System Development Life Cycle is stopped.
§ Top Management will request to repeat the system study if problem with system study is found.
§ Model will explain about repeated phase and sometime information department will make decision to repeat the phase before explain about system study.
§ With Alternative, A decision to repeat System Development Life Cycle phase or not is called Go-No-Go Decision.