fouth Quiz

Information System Design and Analysis

System Investigation Concept (Fourth Quiz)

There are 2 factor to begin system investidation:

1.Discrepancy of gap between system purpose and real condition of system. When there is a discrepancy of gap between system purpose and real condition of system, team investigation started to find what is the problem, learn the system purpose, process of the system and condition when system working.

2.Report of unreal problem detection

We can report detection unreal problem from the following reasons that is:

1. Purpose too much ideal

Purpose too much ideal can make the report investigation can be unreal.

2. Less resources and or manner

Less resources can make detection problem not done especially when detection started without manner.

3. System measuring is not accurate

When system measuring is not accurate, the report can’t use anymore.

4. System purpose are old

The Old system purposes can make the report not up-to-date.

5. The differences between idle system and temporary system

Problem solving:

- Define developing system –> Detailed investigation

- Get the ideal system consensus

- Expand some alternatives

- Select the best alternative

The Goal of investigating is to showing the real problems

The obstacles in Investigation System

When doing investigation several obstacles appear like:

- Time

- Cost

- Knowledge

- Politic

- Get involved

Recommendation

The investigation results are a recommendation that include these following:

- Never take any action –> if there is no problem was found

- System maintenance –> some small problems

- increase ability or user ability

- totally consider to system modification

- put problem into the development system plan

Investigation tactic

Why we need tactic?

- to find all the problem

- to find out the reason

- to find out the best solution

Investigation tactics is very important for the entire elements system so that the system can accept request solution without disturb their activities.

Some tactics that we can do:

- listening the suggestion from system agent

- don’t give beginning solution

- comparing the stories from system agents about similar cases

- notice the logical inconsistent problem

Investigation Techniques

1. Direct:

- Questioner

- Question and Answer

- Monitoring

2. Non-direct:

- Current procedure

- Learn the document

- Sample

- Tabular

System Description at The Moment

- Input

- Output

- File

- Data element

- Transaction volume and action document

- Data flow diagram

Analysis Requirement

Intensive interactions step between systems analyze and end user
where the team development system show their skill to get respons and user trust until achieve good participation.

There are 4 goal wishes to achieve:

- Explain the system completely

- Describe the ideal information system

- Bring the ideal information system at moment with observe the resource constraint

- Give push to user conviction into development system

Method:

- Question and Answer

- Questioner

- Observation

- Current procedure

- Document monitoring

Resource problem

- Time

- Cost

- Skill

- Technology

- External factor

Document analysis requirement

- Analysis guide: relationship with the end user, process monitoring, problems in data gathering.

- User requirement: real needs, report needs, exercise needs, and new system influence.

- System problem: explain time and cost constraint, skill, technology and external factor.

- Document such as data gathering instrument, statistic consensus, data flow according to physic and logical, first data element in data dictionary.

Generating Systems Alternatives

How to make the system at moment condition more close with the ideal system condition?

- create alternative to solve the information system problem

- Applying best alternative wisely

Strategy option

- Distributed versus centralized processing

Changing information decision from centralized data processing to decentralized end user responsibility center.

- Integrated versus dispersed database

System planner must consider what kind of incoming data to database and incoming to file.

- Surround Strategy of System Development

Environment are important strategy in overtake company case because information system from other company possible different with company at moment.

Generating Systems Alternatives

Strategy Options

Options is done before the design operational

Designing Operational Options

Options can be grouped into the design

1. Input

a. Online Vs Off Line Data Entry

b. Keyed Vs Machine Readable Data Entry

c. Centralized Vs Decentralized Data Entry

2. Processing

a. Batch Vs Realtime record update

b. Sequential Vs Direct Access to records

c. Single Vs Multiple User update of records

3. Output

a. Traditional Vs Turn Around Documents

b. Structured Vs Inquiry based reports

Selecting The Proper System

Compare tactics: systems based on the comparison of costs and benefits relative; There are 3 ways the system "A" said the system is superior to the other if :

- "A" has a cost lower than "B" and their profit same.

- "A" has a cost lower than "B" and "A" result in more profits from the "B"

- "A" and "B" have the same costs but the resulting benefit "A" more.

Several Comparative Method System

1. Break Even point Analyisis

2. Payback Period

3. Discounted PayBack period

4. Internal Rate of Return

Cost category

1. Hardware

2. Software

3. People

4. Suppliers

5. Teleccommunications

6. Physical sites

Cost details

Comparing the cost of information systems through the life of the system, analysts projected the cost changes for the future and there are 3 models cost information system, namely Linear, and exponentially Step Function.

Information system cost happen in one time and be able happen continuous.

- Cost information system that occur only once the cost ontime and development costs that occur during the development of the system.

- Cost information system that occur continuously among reccuring cost and operational cost where the cost of this is the case when the operating system information every day.

The Information System Factor

Qualitative factors that lead the performance information system that both of them:

1. Reduce errors

2. Reducing the time to fix errors

3. Reduce the response time from the workstation alternative

4. Accelerate the time of providing information

5. Improve security systems

6. Propagate update records on the source

7. Increasing user satisfaction

Company Strategy Factor

1. Customer satisfaction

2. Sales increased

3. Consumer and vendor commitment

4. Information marketing products

Representation Learning System

1. Make short presentations

2. Reduce the detail description techniques

3. represented clearly with visual tools

4. If using a model using a tool such as a laptop so that more informative

5. Emphasize the benefits of the proposed system with some alternative information that is

appropriate conditions experienced by the company.

Decision to continue or No

- If the company decided to develop the information system, the department will do next, namely the System Design Process.

- If then the System Development Life Cycle (SDLC) will be terminated.

- Often the problem will be found with the system and the study and top management will usually ask for the re-employment system to study.

- Model will describe some of the stages of the repeated and sometimes the information will make a decision before the repeat stage system of study.

- With the alternative, the decision to repeat a previous stage SDLC or not called Go - No-Go Decision.