Download Article: SNAP_APM_2_2

Part 1 – The SNAP Method
Categories & Sub-categories
Record Element
Type (RET)
User recognizable sub-group of data element types within a data
function, and Code Data group as defined in the “Code Data”
paragraph.
Logical File
A logical file is a logical group of data as seen by the user. A logical
file is made up of one or more data entities.
A data function represents functionality provided to the user to meet
internal and external data storage requirements. A data function is
either an internal logical file or an external interface file.
Grouping of data into logical files is the result of the combined effect of
two grouping methods:
 Method a) is process driven, based on the user transactions in
the application.
 Method b) is data driven, based on the business rules.
File Type
Referenced (FTR)
A file type referenced is a data function read and/or maintained by a
transactional function. A file type referenced includes:
 An internal logical file read or maintained by a transactional
function, or
 An external interface file read by a transactional function
 Code Data is grouped to one additional FTR
Database View
In database theory, a database view is the result set of a stored query on
the data, which the database users can query just as they would in a
persistent database collection object. This pre-established query
command is kept in the database dictionary. Unlike ordinary base tables
in a relational database, it is a virtual table computed or collated
dynamically from data in the database, when access to that view is
requested. Changes applied to the data in a relevant underlying table are
reflected in the data shown in subsequent invocations of the view.
Constant Factor
A multiplier used to calculate the number of SNAP points. The SNAP
point size is a result of the [constant factor] times [a complexity
parameter].
Example:
SP =
2*#DETs
2 is the constant factor
#of DETs is the complexity parameter
May 2015
Assessment Practices Manual
5-7