With measurement errors taken into account in the simultaneous fitting of the measurement and the new regression equations, estimation of is unbiased; hence it reflects the true relationship much better. Certainly, introducing latent factors in models is not a free lunch..
A function point is a unit of measurement to express the amount of business functionality an information system (as a product) provides to a user. Function points measure software size. The cost (in dollars or hours) of a single unit is calculated from past projects. As of 2013, there are several recognized standards and/or public specifications for sizing software based on Function Point. 1. ISO Standards. 1  COSMIC: ISO/IEC 19761:2011 Software engineering.
Role of functional testing is to validating the behavior of an application. Functional testing is more important because it always verifies that your system is fixed for release. The functional tests define your working system in a useful manner.unctional testing is executed using the functional specifications given by the client or by the design specifications according to use cases given by the design team.