Individual decision making is more limited than collaborative decision making because as an individual you would only have one or two points of view on the subject as well as knowledge and ideas. If you were to work with more people to decide on something then there would be a good chance that everyone would be able to pitch in ideas and different points of views to overall decide.
Cerebrospinal fluid (CSF), clear, colourless liquid that fills and surrounds the brain and the spinal cord and provides a mechanical barrier against shock. Formed primarily in the ventricles of the brain, the cerebrospinal fluid supports the brain and provides lubrication between surrounding bones and the brain and spinal cord. When an individual suffers a head injury, the fluid acts as a cushion, dulling the force by distributing its impact. The fluid helps to maintain pressure within the cranium at a constant level.
https://www.britannica.com/science/cerebrospinal-fluid
C. Realistic. If your goals are not realistic, then they are un-achievable and you will not make it.