Once all the components in the application have been classified as one of the five major components mentioned above, they have to be rated as either Low, Average, or High.
Ranking is commonly based on File Types Referenced, Data Element Types and Record Element Types.
File Types Referenced (FTRs) represents the total number of internal logical files (ILFs) maintained, read, or referenced, and the external interface files read or referenced by the EI/EO transaction.
Data Element Type (DET) can be defined as unique user-recognizable non-recursive fields including foreign key attributes that are maintained on ILF/EIF.
Record Element Type (RET) is a subgroup of data elements within an ILF/EIF.
For each of the components belonging to Transactional functions, the ranking is based on:
Number of files updated or referenced (FTRs) and Number of data element types (DETs)
For the data components viz., Internal Logical Files (ILF) and External Interface Files (EIF), ranking is based on:
Number of Data Element Types (DETs) and Number of Record Element Types (RETs)
The tables given below provide an example of rankings and ratings given to each component.
FTRs Data Elements 1-4 5-15 >15 0-1 Low Low Average 2 Low Average High >=3 Average High High External Output/External Inquiries
FTRs Data Elements 1-5 6-19 >19 0-1 Low Low Average 2-3 Low Average High >3 Average High High Values or Ratings for Transactions
Ranking Data Elements External Input External Output External Inquiry Low 3 4 3 Average 4 5 4 High 6 7 6
In the above example, if an external input component updates 2 FTRs and references around 16 data elements then the ranking would be HIGH and the associated rating would be 6.
Rankings for ILFs and EIFs
Record Elements Data Elements 1-19 20-50 >50 1 Low Low Average 2-5 Low Average High >5 Average High High Values or Ratings
Ranking Data Elements Internal Logical File External Interface File Low 7 5 Average 10 7 High 15 10