(of the mental representation)
This is an attribute of a mental representation, derived from human history and preceding knowledge. It describes how easy is for an average problem-solver to understand and use a certain mental representation.
Some mental representations are more available than others.
"Cognition is the mental action or process of acquiring knowledge and understanding through thought, experience, and the senses." ("cognition - definition of cognition in English from the Oxford dictionary". www.oxforddictionaries.com. Retrieved 2016-10-27.)
This term encapsulates many high-order functions, such as memory, knowledge, decision making and problem solving, which are marked with the term "cognitive functions".
A problem is an obstacle in the path of achieving a particular goal / purpose / objective. Problem consists of several parts and it can be categorized - this will be addressed elsewhere.
Problem solving process (also Problem solving) is the process of finding a solution to a specific problem. It is the path that leads from the problem space to the appropriate solution space.
There can be many, one or even zero solutions, but it doesn't matter, the process itself can still exist. And there can be many different problem-solving processes for the same problem.
In computational space problem solving is equal to generating an algorithm.
Solution space (also a feasible region, feasible set, search space) is the set of all possible solution candidates of an problem that satisfy the problem's constraints. This is the initial set of candidate solutions to the problem, before the set of candidates has been narrowed down. Solution space can contain any number of possible solutions. An optimization problem is a problem, which has a solution space with the size bigger than one. This means that after constraints are invoked on the problem, more than one possible solution remains.
A solution is the result of the problem-solving process.
To be distinguished: A possible solution is a member of the solution space and the solution is one of the solution-space members that problem-solving process
has selected as its result.
Solution has side features (unrequired features), that are more or less desirable. Perspectives can significantly influence these features.