diff --git a/pgw/PGW_Tests.ttcn b/pgw/PGW_Tests.ttcn
index adae0a4..7bb6910 100644
--- a/pgw/PGW_Tests.ttcn
+++ b/pgw/PGW_Tests.ttcn
@@ -114,6 +114,9 @@
 
 	/* Store last received Gy message */
 	var PDU_DIAMETER g_rx_gy;
+
+	/* number of programs started, used as identifier. */
+	var integer 	g_start_prog_count := 0;
 }
 
 /* configuration data for a given Session */
@@ -706,10 +709,12 @@
 		run_as_user := mp_run_prog_as_user,
 		tun_netns_name := g_pars.tun_netns_name
 	};
+	g_start_prog_count := g_start_prog_count + 1;
 
 	/* Redirect stdout/stderr to the user-specified location */
 	if (redirect_output) {
-		var charstring prefix := mp_run_prog_log_path & "/" & testcasename();
+		var charstring id := testcasename() & "-" & hex2str(g_pars.imsi) & "-" & int2str(g_start_prog_count);
+		var charstring prefix := mp_run_prog_log_path & "/" & id;
 		sprog.command := sprog.command & " 1>>" & prefix & ".prog.stdout";
 		sprog.command := sprog.command & " 2>>" & prefix & ".prog.stderr";
 	}
@@ -720,6 +725,7 @@
 		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
 					log2str("Unable to start program '", command, "'"));
 	}
+	log("Started program '", command, "' with PID ", res.pid);
 	return res.pid;
 }
 
@@ -741,7 +747,7 @@
 		}
 	[] T.timeout {
 		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail,
-					"timeout waiting for user-plane program termination");
+					log2str("timeout (", tout, " seconds) waiting for user-plane program PID ", pid, " termination"));
 		}
 	}
 }