OCR A Level Computer Science - Paper 2 Questions & Answers 100% Correct!

Definition of problem recognition - ANSWERSKnowing what the problem is Identifying the key requirements of a solution Advantages/Disadvantages of problem recognition - ANSWERS- Not all problems can be solved by a computer Definition of backtracking - ANSWERSGoing back to a previously successful match to find another solution Trying an alternative approach if needed Advantages/Disadvantages of backtracking - ANSWERS+ Good for solving logic problems and providing artificial intelligence algorithms - Only useful for sequential problems Definition of heuristics - ANSWERSA best guess to problem solving to reduce computation time. Approximating solutions to ensure a balance between time spent on solving the problem, and getting the best possible solution Advantages/Disadvantages of heuristics - ANSWERS- Best solution ma take too long, or be too expensive - Given solution may not necessarily be the best Definition of data mining - ANSWERSAnalysis of large amounts of data to provide new information Looking for deeper meanings, not obvious conclusions in available data Advantages/Disadvantages of data mining - ANSWERS+ Advantage gained if you can detect unexpected trends/patterns + Identifies anomalies in dataset Definition of performance modelling - ANSWERSCarrying out mathematical analysis to assess efficiency. Knowing how well a solution will perform under load before full implementation Building models to test scenarios Advantages/Disadvantages of performance modelling - ANSWERS+ Simulations predict outcomes + Cost effective, time saving & safety first approach - Requires accurate data - Randomisation may be needed to model uncertainty Definition of pipelining - ANSWERSThe output of one process is the input to another. Some processes must be achieved one after another - queuing up processes Advantages/Disadvantages of pipelining - ANSWERS+ Can speed up execution - Decisions & branches can mean pipeline has to be reset, as the next process is no longer the one needing to be done next Definition of visualisation - ANSWERSRepresentation of reality using symbols, charts a