SYSTEM DEVELOPMENT LIFE CYCLE Changeover Strategies Lesson Objectives To Develop an understanding of the different changeover strategies when introducing a new ICT
system. Changeover Direct Parallel Phased Pilot Direct Changeover
Stop using the old system one day and start using the new system the next day (1). Element of risk particularly if the hardware and software are cutting edge (1).
If the system fails then it can be disastrous to the business Requires fewer resources (people, money, equipment) and is simple, provided nothing goes wrong Need more than easiest/quickest and not just cheapest Parallel Changeover
Old ICT system is run alongside the new ICT system for a period of time until all the people involved with the new system are happy it is working correctly Used to minimise the risk in introducing a new ICT
system Can compare results and be sure it is working properly Lots of unnecessary work (as the work is being done twice) and is therefore expensive in peoples time
It also adds to the amount of planning needed for the implementation Phased Changeover A
module at a time can be converted to the new system in phases until the whole system is transferred Advantage that IT staff can deal with problems caused by a module before moving on to new modules Is
only suitable for systems consisting of separate modules Pilot Changeover This method is ideal for large organisations that have lots of locations or branches where the new system can be used by one branch and then transferred to
other branches over time Implementation scale Disadvantage is on a much smaller and manageable
is that is takes longer to implement the system in all the branches Past Paper Questions A system analyst has a choice of direct changeover or parallel running when updating a computer system. Describe these two different potential changeover strategies and describe the advantages and
disadvantages of each of the different strategies.  Once the new computer system is up and running, it has to be maintained. Describe two different system maintenance methods and illustrate each method with appropriate examples. 
All'interno di questo comitato, strinse dei rapporti col giornalista George Parker, il quale aveva gestito una campagna pubblicitaria per . Grover. Cleveland. durante la sua terza candidatura presidenziale. Nel tardo 1904, i due colleghi fondarono la terza società di pubbliche...
The Moho is generally flat and featureless except for local crust-mantle imbrication zones interpreted as subduction scars. Superior Province crust has a layered velocity structure, ranging from as low as 5.2 km/s near the surface, to as high as 7.5...
Background. The guidelines published were for hiring women for mass transit jobs (bus, train, subway) in 1943. This was during WWII when organizations sought to hire women in jobs that were previously held my men.
Evolution Chapters 22-24 * * * * * Biological Species Concept developed by Ernst Mayr biological species are genetically isolated from other species group of populations that have the potential to interbreed in nature and produce viable offspring.
Compare and contrast the characteristics of life safety rope and utility rope. ... NFPA® 1983 classifies two additional types of ropes used in rescue. 8- Escape rope. Water rescue throw line. NFPA® 1983 sets requirements and regulations for life safety...
If users are asked to make security decisions too frequently, they may become habituated and approve all future requests. Previous solutions & Limitation. Prompt permission request at run-time. Action is not reversible. Data is sensitive. Incurs additional cost.
Unit 3A: How much is this? Taiwan's currency is the New Taiwanese Dollar (NT$). Bills come in denominations of NT$100, NT$200, NT$500, NT$1000 and NT$2000. Coins come in units of NT$1, NT$5, NT$10, NT$20 (rare) and NT$50. Taiwan uses the...
In Summary. Have fun with your sketchbook cover, let it reflect something about yourself! Be creative in the materials you are "Re"using. The options are endless:Cereal boxes, (any cardboard for cover will work), or rigid plastic, old gift tissue, fabric...
Ready to download the document? Go ahead and hit continue!