diff --git a/Source/LifePlay/LPSessionLogSubsystem.cpp b/Source/LifePlay/LPSessionLogSubsystem.cpp
index 16d7243..b1ecb38 100644
--- a/Source/LifePlay/LPSessionLogSubsystem.cpp
+++ b/Source/LifePlay/LPSessionLogSubsystem.cpp
@@ -6,7 +6,11 @@
 #include "GeneralProjectSettings.h"
 #include "HAL/FileManager.h"
 #include "HAL/IConsoleManager.h"
+#include "Engine/GameInstance.h"
 #include "Misc/App.h"
+#include "Misc/CommandLine.h"
+#include "Misc/Parse.h"
+#include "UObject/UnrealType.h"
 #include "Misc/EngineVersion.h"
 #include "Misc/OutputDevice.h"
 #include "Misc/Paths.h"
@@ -124,10 +128,56 @@ void ULPSessionLogSubsystem::Initialize(FSubsystemCollectionBase& Collection)
 	}
 
 	LogStartupSummary();
+	DumpRequestedVariables(TEXT("demarrage"));
+}
+
+void ULPSessionLogSubsystem::DumpRequestedVariables(const TCHAR* When) const
+{
+	FString List;
+	if (!FParse::Value(FCommandLine::Get(), TEXT("LPDumpVars="), List, false))
+	{
+		return;
+	}
+	const UGameInstance* GI = GetGameInstance();
+	if (!GI)
+	{
+		return;
+	}
+
+	TArray<FString> Names;
+	List.ParseIntoArray(Names, TEXT(","), true);
+	for (const FString& Name : Names)
+	{
+		const FProperty* Prop = GI->GetClass()->FindPropertyByName(FName(*Name));
+		if (!Prop)
+		{
+			UE_LOG(LogLifePlay, Warning, TEXT("[dump %s] %s : variable introuvable sur %s"), When, *Name, *GI->GetClass()->GetName());
+			continue;
+		}
+
+		if (const FArrayProperty* ArrayProp = CastField<FArrayProperty>(Prop))
+		{
+			FScriptArrayHelper Helper(ArrayProp, ArrayProp->ContainerPtrToValuePtr<void>(GI));
+			UE_LOG(LogLifePlay, Display, TEXT("[dump %s] %s : %d element(s)"), When, *Name, Helper.Num());
+			for (int32 i = 0; i < Helper.Num(); ++i)
+			{
+				FString Text;
+				ArrayProp->Inner->ExportTextItem_Direct(Text, Helper.GetRawPtr(i), nullptr, const_cast<UGameInstance*>(GI), PPF_None);
+				UE_LOG(LogLifePlay, Display, TEXT("[dump %s] %s[%d] = %s"), When, *Name, i, *Text.Left(600));
+			}
+		}
+		else
+		{
+			FString Text;
+			Prop->ExportTextItem_Direct(Text, Prop->ContainerPtrToValuePtr<void>(GI), nullptr, const_cast<UGameInstance*>(GI), PPF_None);
+			UE_LOG(LogLifePlay, Display, TEXT("[dump %s] %s = %s"), When, *Name, *Text.Left(600));
+		}
+	}
 }
 
 void ULPSessionLogSubsystem::Deinitialize()
 {
+	DumpRequestedVariables(TEXT("fin"));
 	LogSessionSummary();
 
 	if (Counter.IsValid())
diff --git a/Source/LifePlay/LPSessionLogSubsystem.h b/Source/LifePlay/LPSessionLogSubsystem.h
index 279bf96..592d633 100644
--- a/Source/LifePlay/LPSessionLogSubsystem.h
+++ b/Source/LifePlay/LPSessionLogSubsystem.h
@@ -31,6 +31,13 @@ public:
 private:
 	void LogStartupSummary() const;
 
+	/**
+	 * Diagnostic (lot L5) : ecrit dans le journal le contenu des variables de l'instance de
+	 * jeu (GI) nommees sur la ligne de commande, par exemple -LPDumpVars=MeshSexRace,LegacyPercentage.
+	 * Un tableau est ecrit element par element. Sans l'option, ne fait rien.
+	 */
+	void DumpRequestedVariables(const TCHAR* When) const;
+
 	TSharedPtr<FLPLogCounter> Counter;
 	double StartTime = 0.0;
 };