diff --git a/Makefile b/Makefile
index d1445ecc..887e0c3d 100644
--- a/Makefile
+++ b/Makefile
@@ -322,6 +322,40 @@ SPELL_OPTIONS = --enable-colors --ignore-words-list $(IGNORE_WORDS)
 spell:
 	codespell $(SPELL_OPTIONS) ./src
 
+# McCabe's Cyclomatic Complexity Scores
+# sudo apt install pmccable
+COMPLEXITY_SRC = \
+	$(wildcard ./src/bacnet/*.c) \
+	$(wildcard ./src/bacnet/basic/*.c) \
+	$(wildcard ./src/bacnet/basic/binding/*.c) \
+	$(wildcard ./src/bacnet/basic/service/*.c) \
+	$(wildcard ./src/bacnet/basic/sys/*.c) \
+	./src/bacnet/basic/npdu/h_npdu.c \
+	./src/bacnet/basic/npdu/s_router.c \
+	./src/bacnet/basic/tsm/tsm.c
+
+.PHONY: pmccabe
+pmccabe:
+	pmccabe $(COMPLEXITY_SRC) | awk '{print $$2,$$6,$$7}' | sort -nr | head -20
+
+# sudo apt install complexity
+#  0-9 Easily maintained code.
+# 10-19 Maintained with little trouble.
+# 20-29 Maintained with some effort.
+# 30-39 Difficult to maintain code.
+# 40-49 Hard to maintain code.
+# 50-99 Unmaintainable code.
+# 100-199 Crazy making difficult code.
+# 200+ I only wish I were kidding.
+.PHONY: complexity
+complexity:
+	complexity $(COMPLEXITY_SRC)
+
+# sudo apt install sloccount
+.PHONY: sloccount
+sloccount:
+	sloccount .
+
 .PHONY: clean
 clean: ports-clean
 	$(MAKE) -s -C src clean
diff --git a/aptfile b/aptfile
index 2daf4080..53c2a989 100644
--- a/aptfile
+++ b/aptfile
@@ -24,6 +24,8 @@ package "gitg"
 package "tofrodos"
 package "clang-format"
 package "sloccount"
+package "complexity"
+package "pmccabe"
 
 # install ARM compiler and debugging tools
 package "gcc-arm-none-eabi"
diff --git a/doc/README.sloc b/doc/README.sloc
index fc991858..3c2cfd78 100644
--- a/doc/README.sloc
+++ b/doc/README.sloc
@@ -1,10 +1,12 @@
 SLOC	Directory	SLOC-by-Language (Sorted)
-84560   ports           ansic=70066,asm=9265,cpp=4651,xml=424,sh=154
-72724   src_bacnet      ansic=72724
-15569   apps            ansic=15011,perl=463,javascript=91,sh=4
-721     test            ansic=721
-257     bin             sh=257
-5       top_dir         sh=5
+118011  ports           ansic=101988,asm=10755,cpp=4651,xml=463,sh=154
+78632   src_bacnet      ansic=78632
+28295   test            ansic=27663,cpp=598,xml=34
+22418   apps            ansic=21856,perl=463,javascript=89,sh=10
+644     build           ansic=610,xml=34
+565     zephyr          ansic=565
+302     bin             sh=302
+112     top_dir         sh=112
 0       cmake           (none)
 0       doc             (none)
 0       license         (none)
@@ -12,24 +14,24 @@ SLOC	Directory	SLOC-by-Language (Sorted)
 
 
 Totals grouped by language (dominant language first):
-ansic:       158522 (91.19%)
-asm:           9265 (5.33%)
-cpp:           4651 (2.68%)
-perl:           463 (0.27%)
-xml:            424 (0.24%)
-sh:             420 (0.24%)
-javascript:        91 (0.05%)
+ansic:       231314 (92.91%)
+asm:          10755 (4.32%)
+cpp:           5249 (2.11%)
+sh:             578 (0.23%)
+xml:            531 (0.21%)
+perl:           463 (0.19%)
+javascript:        89 (0.04%)
 
 
 
 
-Total Physical Source Lines of Code (SLOC)                = 173,836
-Development Effort Estimate, Person-Years (Person-Months) = 45.00 (539.96)
+Total Physical Source Lines of Code (SLOC)                = 248,979
+Development Effort Estimate, Person-Years (Person-Months) = 65.61 (787.38)
  (Basic COCOMO model, Person-Months = 2.4 * (KSLOC**1.05))
-Schedule Estimate, Years (Months)                         = 2.28 (27.30)
+Schedule Estimate, Years (Months)                         = 2.63 (31.51)
  (Basic COCOMO model, Months = 2.5 * (person-months**0.38))
-Estimated Average Number of Developers (Effort/Schedule)  = 19.78
-Total Estimated Cost to Develop                           = $ 6,078,387
+Estimated Average Number of Developers (Effort/Schedule)  = 24.99
+Total Estimated Cost to Develop                           = $ 8,863,648
  (average salary = $56,286/year, overhead = 2.40).
 SLOCCount, Copyright (C) 2001-2004 David A. Wheeler
 SLOCCount is Open Source Software/Free Software, licensed under the GNU GPL.