Reduction is one of the Three Rs which can be readily achieved in practice. This can be done by careful consideration of the experimental strategy and the implementation of good experimental design. Moreover, strategic planning leads to 'best' scientific practice and can have a positive impact on both refinement and replacement. The FRAME Reduction Steering Committee has developed a flow chart for an overall strategy for planning and conducting biomedical research. This, and important planning considerations for each of the steps proposed, are discussed. The strategy involves taking an initial overview and undertaking related background research, then planning a sequence of experiments expected to give satisfactory results with the least animal use and minimal severity, choosing an efficient design for each experiment in the sequence, reviewing the results of one experiment before progressing to the next, and conducting an overall analysis at the end of the programme. This approach should minimise animal use and maximise the quality of the resultant scientific output.
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