what do you understand by the doctrine of Precedent? And How does it operate in Tanzania?

The doctrine of precedent is a doctrine in which the judgments or decision of superior court are used as the authorities for reaching the same decisions in subsequent cases. In Tanzania the judgments or decisions of the Court of Appeal are binding upon the High Court of Tanzania and Courts subordinate there to and are normally followed by the Court of Appeal itself. Decisions of High Court of Tanzania are binding on inferior Courts or Courts subordinate to it. 

Note:1). Decision of Courts subordinate to High Court do not create any binding precedent. 

2). A Lower Court is not bound by all aspects of a previous decisions, but only those parts of the judgments that constitute the principle of the decision.