There is also a functional software size measurement methodology, which is based on the assumption that the productivity of software development is somehow related to the functionality. Areas of functionality that are taken into account are called information domain values, some of which are listed below:
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Let us briefly consider the first stage of the two-stage process of counting functional points (FP). Stage 1 is started by the actor who has experience in conducting a functional points analysis. The actor must answer the questions contained in the special questionnaire using the numbers indicated in the questionnaire header. After receiving the answers to all 14 questions of the questionnaire, it is necessary to add all the numbers representing the answers and transfer the received amount to the next step.
In stage 2, you will need to multiply these numbers by the corresponding weights, sum up the received results and put the amount in the “Total Amount” field according to the instructions. As the factor SUM (F,), it is necessary to substitute the sum of the complexity refinement coefficients obtained in stage 1.
The functional point is a weighted index metric type. It is intended to change the functionality of the software package, as the end user sees it.