diff --git a/v1.3.1/README.org b/v1.3.1/README.org
index d7f7cb4..b930596 100644
--- a/v1.3.1/README.org
+++ b/v1.3.1/README.org
@@ -33,6 +33,8 @@ can be added (mean, interval, interval2).
 
 * Measurement points
 
+To simplify the scenario explanation, the following measurement points
+are pre-defined:
 1. (5;10)
 2. (1;10)
 3. (5;1)
@@ -47,6 +49,49 @@ can be added (mean, interval, interval2).
 
 * Common rules
 
+Except if stated otherwise, all the scenarios follow these rules.
+
+** Devices used
+
+- Mobile terminal: Fonera 2.0 with OwlPS Client v1.3.0-11-gc4e0352.
+- Aggregation server: Asus EEE-PC 701 4G running Debian GNU/Linux
+  squeeze (Linux 2.6.32), with an Atheros AR 500 Wi-Fi interface. It
+  runs OwlPS Aggregator v1.3.1-14-ge278aab.
+- Listeners: 4 Fonera 2.0, running OwlPS Listener v1.3.0-11-gc4e0352.
+
+** Environmental parameters:
+
+- The temperature is controlled around 22°C.
+- The humidity varies from 38% to 55%.
+
+** Listeners
+
+The capture points are attached to the walls and all have their antennas
+in vertical position, in the direction of the ceiling.
+Their coordinates are given in the OwlPS Positioner's configuration file
+([[./owlps-config/listeners-fonera.csv]]).
+
+The OwlPS Listener program runs continuously. It is launched with the
+following command:
+: owlps-listenerd -A -v -i 192.168.11.254 -I 192.168.11.254 -r ath1 -w ath0
+
+** Client
+
+The mobile terminal continuously sends positioning requests with the
+following parameters:
+- 20 packets (-n20),
+- 10 ms between two packets (-t10),
+- 800 ms between two requests (-F800).
+The destination IP address is the Aggregator's one (i.e. 192.168.11.254
+in our setup).
+
+The complete command used to launch OwlPS Client is the following:
+: owlps-client -i 192.168.11.254 -n 20 -t 10 -F 800
+
+The mobile terminal's antenna is vertical.
+
+** Measurement-related rules
+
 - When a human operator carries the mobile terminal, the altitude of the
   terminal is 1 m.