Final answer:
The A-T-A-R model should be initially completed and calculated using best estimates (A. True) rather than 'guesstimates'.
Step-by-step explanation:
The A-T-A-R model should be initially completed and calculated using best estimates (A. True) rather than 'guesstimates'. The A-T-A-R model stands for Attitudes, Tasks, Actions, and Results, and it is used as a tool for goal-setting and self-reflection. It is important to use accurate and realistic estimates as the foundation for the model to ensure meaningful and achievable goals are set.