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Additional info for IFPUG Function Point Counting Practices (2010)
Item number, description, price, weight). The Header section is counted as one RET. The line items are a repeating group and is counted as an additional RET. EXAMPLE 2 A single repeating attribute such as multiple account numbers for a customer is not a repeating group and is counted as a single DET and not as a RET. EXAMPLE 3 A multiple occurring group of DETs such as year, month and budget amount is a repeating group but is counted as three DETs and not as a RET. 6 5 Measurement Process Determine the functional complexity for each data function The functional complexity of each data function shall be determined using the number of RETs and DETs in accordance with Table 1.
Other sizing measures can be used to size, for instance, non-functional requirements. Both result in different size measures representing different dimensions of software size: IFPUG-FP for functional size and any other for non-functional size. While these sizes cannot be added together because they represent different dimensions (like volume and temperature of a room), they can both be used in estimating the effort towards the development of an application or a system. “A Framework for Functional Sizing” provides guidance in distinguishing between functional size and non-functional size.
ISO/IEC 14143-1 distinguishes between two subsets of user requirements: • Functional User Requirements • Non-Functional User Requirements The ISO/IEC 14143-1 definitions are as follows: ISO/IEC 14143-1 - Definitions Functional Size A size of the software derived by quantifying the Functional User Requirements Functional User Requirement A subset of the user requirements specifying what the software shall do in terms of tasks and services. January 2010 Note: Functional User Requirements include but are not limited to: • Data transfer (for example: input customer data, send control signal) • Data transformation (for example: calculate bank interest, derive average temperature) • Data storage (for example: store customer order, record ambient temperature over time) • Data retrieval (for example: list current employees, retrieve aircraft position) Function Point Counting Practices Manual 1-3 Part 2 – The Bridge – Applying the IFPUG FSM Method NonFunctional User Requirement 1-4 Part 2 – The Bridge – Applying the IFPUG FSM Method ISO does not provide a definition for Non-Functional User Requirements, but gives some examples in a note.