Which of the following phases does NOT belong to Sigmoid curve a. Maturity b. Decline c. learning d. delivery

### Delivery

## Step1: Understanding the Sigmoid Curve### The Sigmoid curve, also known as the S-curve, is a type of growth curve that is often used to model the growth of populations, the spread of information, and other phenomena that grow rapidly and then level off. It is characterized by three phases: the learning phase, the growth phase, and the maturity phase.## Step2: Identifying the Phases of the Sigmoid Curve### The learning phase is where the curve starts to increase, but at a slow rate. The growth phase is where the curve increases rapidly. The maturity phase is where the curve starts to level off and approaches a plateau.## Step3: Comparing the Options with the Phases of the Sigmoid Curve### Comparing the options given in the question with the phases of the Sigmoid curve, we can see that 'Maturity', 'Learning', and 'Decline' are all phases of the Sigmoid curve. However, 'Delivery' is not a phase of the Sigmoid curve.