The court said the directions would be applicable to trials of cases involving grave offences punishable with more than seven years' imprisonment.
"As far as practicable, public witnesses, and in particular eye witnesses, should be examined at the earliest point in time once the witness action commences," one of the directions said.
About the other directions, the high court said "at every hearing, the trial court will note the status of summoning of the public witnesses. It will elicit from the APP (prosecutor) and record the reasons for the non-appearance of the public witnesses summoned for that date."