LOC oriented software estimation model $E=3.2*(KLOC)^{1.05}$ is called :

Question

Accepted Answer

The correct option is (3):
The formula $E=3.2\times(KLOC)^{1.05}$ is the precise effort equation for the **Organic mode** within the **Basic (or Simple) COCOMO (Constructive Cost Model)**, which was introduced by Barry Boehm in 1981. In this model, $E$ represents the estimated effort in person-months (PM), and $KLOC$ is the estimated size of the finished software in thousands of lines of code. This particular formula is reserved for 'Organic' projects, which are characterized as small-to-medium software efforts where the development team is highly familiar with the application, works in a stable environment, and operates with less rigid formalities. The Boehm simple model is a foundational empirical model that estimates effort based solely on the size metric.

The incorrect option is (1):
The Walston-Felix model is an earlier empirical model for software effort estimation, often cited alongside Boehm's work. While it is also based on LOC and uses a similar power-law equation, its parameters are distinctly different from the one presented. A common formulation of the Walston-Felix model is $E = 5.2 \times (KLOC)^{0.91}$. The difference in both the multiplicative constant (5.2 vs 3.2) and the exponent (0.91 vs 1.05) means that the equation in the question does not represent the Walston-Felix model.

The incorrect option is (2):
The Bailey-Basili model, resulting from studies at NASA's Goddard Space Flight Center, is known for its focus on multi-variable estimation, specifically including the factor of complexity in its analysis. Although simpler regression equations based on LOC were derived from this work, they usually feature different coefficients, such as $E = 5.5 + 0.73 \times (KLOC)^{1.16}$ in one variant. The Bailey-Basili model is more sophisticated than the simple power-law models and is not defined by the exact formula $E=3.2\times(KLOC)^{1.05}$.

The incorrect option is (4):
The Doty model (developed by RADC/Rome Air Development Center) refers to a collection of several different predictive equations designed for various types of projects, including systems, commands, and applications. These models are typically more complex and specialized than the basic COCOMO formula. The parameters in the Doty equations vary significantly depending on the system type, and none of the standard or well-known Doty formulations match the specific $E=3.2\times(KLOC)^{1.05}$ structure, which is unambiguously assigned to the Boehm simple model's Organic category.