ANALYSIS AND DESIGN OF INFORMATION SYSTEM

Investigation System Concept

System investigation here is done when there is or there is a gap in the difference (gap) between the purpose of the system and actual system conditions. For example, the system is to satisfy customers in terms of services company, but the system has a condition which can not satisfy customers, as early goals of the system is made, so that here the system is needed to improve the system of investigation that has been there.

There is a system of investigation here also be due to a detection of the problems that the report does not really real, such as:

• Too ideal destination

• Lack of resources and / or attitude

• Measurement system is less accurate

• System that is the purpose behind

• The difference between the ideal system and the system while

Problem solving:

• Decompose the system is running.

• Where is the investigation carried out here in detail

• Getting a consensus that the ideal system

• Developed several alternative

• Selecting the best alternative

Constraint in Investigation System

When doing investigation several constraints appear like:

• Time

• Cost

• Knowledge

• Politic

• Get involved

Recommendation

Result of investigation is one recommendation, one that one of it is as follows:

• Don't take action whatever since undiscovered problem.

• Doing preserve system for problem what do little.

• Increasing ability or user skill at deep going or utilizes information system.

• Regarding for system modification totally, so needs thinking to substitute it with system a new one.

• Placing happening problem into systems developmental plan which shortly be done.

Investigation Tactics

Why need the tactics?

• Finding all problem

• Knowing cause of problem appearance

• Determining correct solution

Investigation tactics Is conducted so that all system element can accept the solution offer without bothering their activity

Some tactics which can be conducted:

• Listening opinion of system perpetrator

• Don’T give the resolving early

• Comparing story some people of system perpetrator to same case

• Paying attention to problem of inconsistent logical

Investigation Technique

1. Direct:

   • Questioner

   • Question and Answer

   • Monitoring

2. Non-direct:

• Current procedure

• Learn the document

• Sample

• Tabular

Analysis Requirement

Stage of intensive interaction between the systems analyst with the end user where the system shows the development team expertise to get feedback and trust so that the user get a good participation.

Four Purpose That Want Achieved:

• Explain the complete system

• Information system that describes the ideal

• Bringing information system to the ideal conditions at this time with attention to the constraints of resources

• Provide encouragement to the confidence in the system development

Method

• FAQ

• Quisioner

• Observation

• Procedure analysis

• Observation document

Constraints Of Resource

• Time

• Money

• Expertise

• Technology

• External factors

Analysis Document Requirement

• Landing analysis: Relationships with end users, the observation process, problems in data collection.

• The user needs: The need actual, reporting requirements, training needs and the influence of the new system.

• System constraints: Explain the constraints of time and cost, expertise, technology, and external factors.

• Documents such as data collection instruments, statistical consensus, the logical flow of data and physical, data elements in the initial data dictionary.

Generating Systems Alternatives

How the way to bring closer system condition in now with ideal system condi
tion ?

• Make alternative for solving the information system problem.

• The best alternative applied wisely.

Strategy choise

• Distributed versus centralized processing
  Alteration information decision of centralized data processing to decen-
  tralized end user responsibility center.

• Integrated versus dispersed database
  Designing system must consider the data, which it to enter in database &
  in file.

• Surround Strategy of System Development
  The circle is important strategy in the way of taking company because in-
  formation system from other company maybe is differing.

Tactics choise : before designing operational selection.

Designing operational selection.
Designing selection can be grouped into :
1. Input
Online Vs Off Line Data Entry
- Keyed Vs Machine Readable Data Entry
- Centralized Vs Decentralized Data Entry
2. Processing
- Batch Vs Realtime record update
- Sequential Vs Direct Access to records
- Single Vs Multiple User update of records
3. Output
- Traditional Vs Turn Around Documents
- Structured Vs Inquiry based reports

Selecting the Proper System

• Equal tactic: equivalent system based on cost and profit relatively. There is 3 system, A called more excellent with other system if:

  • A have low cost then B and their profit same.

  • A have low cost then B and A produce profit more than B.

  • A and B have same cost but produce of profit A more than B.

• Several comparative method system

• Break Even point analysis

• Payback period

• Discounted payback period

• Internal rate of return

• Cost category

  • Hardware

  • Software

  • People

  • Suppliers

  • Telecommunications

  • Physical sites

• Cost details

Equal system information cost by means of life system, analyst projection several cost change for future and 3 cost model information system that is Linear, Exponential and Step Function.

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

  • Information system cost happening in one time that is on-time cost and development cost while system development consist.

  • Information system cost happening continuous there are recurring cost with operational cost while cost happen at information system operated every day.

Factor Of Information System

• Reduce errors

• Reduce the time to fix errors

• Reducing the response time from the workstation alternative

• Accelerating the provision of information

• Increase the security system

• Have active update source record

• Increase user satisfaction

Presenting Study Of System

• To do presentation with short time.

• Lessen technique explanation with detail

• If using model use appliance assist for example laptop so that more informative.

Decision Drawns Out Or Not

• If firm decides to develop system therefore information department will do succeeding process which is System Design Process.

• If contrariwise therefore System Development Life Cycle (SDLC) will be discontinued.

• Oft will find problem with study system and usually top management will ask for to do its reworking to study system.

• Model will word some part step which and sometimes information department will make repeat decision step before word study system.

• With alternative, decision for repeat one SDLC'S step in advance or not been called Go – No. –Go Decision.