Before developing the mappings you need to prepare the specifications document for the mappings you need to develop. A good template is placed in the templates folder You can use your own template as long as it has as much detail or more than that which is in this template.
While estimating the time required to develop mappings the thumb rule is as follows.
1. Simple Mapping – 1 Person Day
2. Medium Complexity Mapping – 3 Person Days
3. Complex Mapping – 5 Person Days.
Usually the mapping for the fact table is most complex and should be allotted as much time for development as possible.
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