diff --git a/README.md b/README.md
index ca7a57f6a3ad3065bca9ad5632a0ab12a0ce8f88..5e30d0af27eb8f121414e17b75da2ca6cbdbb0ec 100644
--- a/README.md
+++ b/README.md
@@ -110,7 +110,10 @@ pybatsim sched/rejector.py
 
 Try to understand the output of the scheduler in the terminal as well.
 
-That's it, you run your first simulation!
+That's it, you have run your first simulation!
+
+### Exercise 3: understand and visualize Batsim outputs
+
 Simulation outputs are stored in the `out` directory.
 You have [schedule-centric outputs](https://batsim.readthedocs.io/en/latest/output-schedule.html) (`schedule.csv`) and [job-centric outputs](https://batsim.readthedocs.io/en/latest/output-jobs.html). 
 Open them, read the doc, and make sure you understand most of the fields.
@@ -120,35 +123,45 @@ Have a look also at the file `out/example_jobs.csv` to see how the job output lo
 Finally, to get a visual representation of the outputs, we will use the visualization software `evalys`.
 We provide a wrapper of `evalys` with the main functions that you need in the file `util/plot.py`.
 The `jobs.csv` output that was produced before is not suitable for visualization since it has no jobs that executed. 
-Produce the visualization:
+Visualize the jobs on the example instead:
 
 ```bash
 python util/plot.py out/example_jobs.csv
 ```
 
-You have an option to store the output in a PDF file. 
+NB: the script has an option to store the output in a PDF file. 
 Check available options with `python util/plot.py -h`.
 
-### Exercise 3: FCFS monomachine
-Now, it's time to develop your own scheduler!
-We will start with a FCFS monomachine: it schedules the jobs by order of arrival (and lexicographical order on the job ID in case of a tie).
+### Exercise 4: FCFS monomachine
+Now, it's time to develop your own scheduler.
+We will start with a FCFS monomachine: it schedules the jobs by order of arrival.
 
-Create a file `fcfsMono.py` in `sched` directory.
+Create a file `fcfsMono.py` in the `sched` directory.
 Draw inspiration from the template in `sched/template.py` to create your scheduler.
 
 Warning: the file name and class name must match (for example, `fcfsMono.py` for the file name and `FcfsMono` for the class name).
 
-Test it on `2jobs.json` and `ex1.json` inputs, and other inputs that you will create. 
-Visualize the outputs with evalys to see if it worked correcty.
+You can use the following functions:
+- `job.id`, `job.submit_time`, `job.profile.name`, `job.requested_resources`, etc. to retrieve information about the job
+- `self.bs.reject_jobs(list_of_jobs)`: to reject all the jobs in the list `list_of_jobs` (message [REJECT_JOB](https://batsim.readthedocs.io/en/latest/protocol.html#reject-job) in Batsim protocol)
+- `self.bs.execute_jobs(list_of_jobs)`: to execute all the jobs in the list `list_of_jobs` (message [EXECUTE_JOB](https://batsim.readthedocs.io/en/latest/protocol.html#execute-job) in Batsim protocol). **Warning:** this function expects the jobs to have been allocated to one or several machines first. Use `job.allocation = 0` in the monocore context.
+
+Test your algorithm on `2jobs.json` and `ex1.json` inputs, and other inputs that you will create. 
+Visualize the outputs with the visualization script to see if it worked correctly.
 
 
 
 ## Session 2: monomachine schedulers
-- séance 2 : monomachine + d'autres algos : RMS, EDF (3 cas: infra sous-dimensionnée / normalement dim / sur-dim, remarquer que sur du surdimensioné, l'algo change rien)
-	=> example simple avec 1 grosse tâche + 1 petite tâche avec deadline, en EDF sans preamption ça passe pas.
+**Objective for this session:** 
+- implement another monomachine scheduler: EDF
+- compare FCFS and EDF in terms of mean waiting time and tardiness
+
+
 
 ## Session 3: multimachine schedulers
 - séance 3 : multimachine hétérogènes en vitesse avec deadlines 
+- séance 2 : monomachine + d'autres algos : RMS, EDF (3 cas: infra sous-dimensionnée / normalement dim / sur-dim, remarquer que sur du surdimensioné, l'algo change rien)
+	=> example simple avec 1 grosse tâche + 1 petite tâche avec deadline, en EDF sans preamption ça passe pas.
 
 ## Session 4: energy constraint
 - séacnz 4 : EDF avec contrainte énergétique (powercap ou energycap)
@@ -157,11 +170,6 @@ Visualize the outputs with evalys to see if it worked correcty.
 - séance 5 : implémenter la préamption
 
 
-## Open bugs
-- mismatch python version if I want to use batsim and evalys. Either `python util/plot.py out/_jobs.csv ` or ` batsim -p expe/1machine.xml -w expe/ex1.json -e out/` make an error
-- no working poetry in nix-shell
-- will that work in the lab's machines?
-
 
 [Batsim]: https://batsim.org/
 [Nix]: https://nixos.org/nix/