Index: script.txt
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--- script.txt
+++ script.txt
@@ -41,44 +41,43 @@
 - All its software and documentation is released under Free licenses, anyone
   can setup a CONFINE testbed like Community-Lab.
 
 * Challenges and requirements
 ** Simple management vs. Distributed node ownership
-- In contrast with e.g. indoors testbeds that belong wholly to the same
-  entity.
+- How to manage devices belonging to diverse owners.
 
 ** Features vs. Lightweight, low cost (free & open)
 - Devices ranging from PCs to embedded boards.
 - Need light system able to run on very different devices.
 
+** Heterogeneity vs. Compatibility
+- Some devices allow hacking while others don't.
+- Diverse connectivity and link technologies (wireless, wired, fiber).
+
 ** Familiarity & flexibility vs. System stability
-- Familiar Linux env with root access to researchers.
-- Keep env isolation (nodes are shared by experiments).
-- Keep node stability (to avoid in-place maintenance, some difficult to reach
-  node locations).
+- Researchers prefer a familiar Linux env with root access.
+- But experiments sharing the same node must be isolated.
 # Frozen tower.
+- Accessing node locations can be hard, so keep node stability to avoid
+  in-place maintenance.
 
 ** Flexibility vs. Network stability
 - Network experiments running on nodes in a production network.
-- Allow interaction with CN at the lowest level possible but not disrupting or
-  overusing it.
+- Allow interaction at the lowest possible layer of the CN while not
+  disrupting or overusing it.
 
 ** Traffic collection vs. Privacy of CN users
 - Experiments performing traffic collection and characterization.
 - Avoid researchers spying on users' data.
 
 ** Link instability vs. Management robustness
-- Deal with frequent network outages in the CN.
+- Management must deal with frequent network outages in the CN.
 
 ** Reachability vs. IP address provisioning
 - Testbed spanning different CNs.
 - IPv4 scarcity and incompatibility between CNs, lack of IPv6 support.
 
-** Heterogeneity vs. Compatibility
-- Lots of different devices (disparate connectivity and software openness).
-- Lots of different link technologies (wireless, wired, fiber).
-
 * Community-Lab testbed architecture
 ** Overall architecture
 This architecture applies to all testbeds using the CONFINE software.
 # Move over overlay diagram less overlay connections plus overlay network.
 - A testbed consists of a set of nodes managed by the same server.