How would you deal with students arriving late in their class?

The whole class or some individuals?If it is the whole class then there is a REAL problem.If it is some individauls l would want to make a follow up and see how often they do so and  the  reasons behind their coming late.    My remedy would be to talk to them first and then see if they change.On more than one occasion,if it is an individual,l have scored good success.The group lateness is even easier to curb than individual late comers.So in short,talk to those concerned and establish what delays them.Then make your distaste for this behavior clear.You won't get lost,all will fall in place from there on.

for the student who arrive late at the first time for him, i'll punish him to stand10 minutes in the classif he repeat it i'll punish him to stand half time of the class sesion , repeat it again it is forbiden to enter the class for the next time only

LISTEN THEM AND THEN TALK THEIR PARENTS TO HELP THEM, IN THIS PROBLEM.

First time give a verbal warning

Second time writen notice

Third time principal's office :

Votre question est ambigue concernant le RETARD ! si c'est le retard aprés l'heure c'est un probleme qui relève des prérogatives de l'adminitration avec les parents d'élèvesMais si le retard concerne l'arrivée de l'élève aprés plusieurs seances ( et je pense que c'est l'objet de votre question) il faut envisager des séances dites de RATRAPAGEYour question is ambiguous regarding LATE! if it is after delay time is a problem that is the prerogative of the adminitration with parentsBut if the delay relates to the arrival of students after several sessions (and I think that is the subject of your question) should be considered say sessions RATRAPAGE