The binding legal principles established are: (1) For purposes of Schedule 2, Part 1(a) of the Criminal Law Amendment Act 105 of 1997, a murder is "planned or premeditated" even if the planning occurs shortly before the killing. (2) When determining whether substantial and compelling circumstances exist under section 51(3)(a), courts must consider all factors including the accused's personal circumstances, the interests of society, and the gravity of the offense, with due recognition that the legislative emphasis has shifted to the objective gravity of the crime and the public's need for effective sanctions. (3) Mitigating factors such as youth, first offender status, guilty plea, cooperation, and remorse must be weighed in context against aggravating circumstances and assessed holistically. (4) An appellate court may only interfere with a sentence in the absence of misdirection where the disparity between the trial court's sentence and what the appellate court would impose is so marked as to be "shocking," "startling" or "disturbingly inappropriate." (5) Sentencing disparity with a co-accused, even if tried separately, does not constitute a substantial and compelling circumstance where the minimum sentence provisions of the Act properly apply to the appellant.