diff --git a/.gitignore b/.gitignore
index c375cd4..7c71f2f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 \.~*
+scratch
diff --git a/Stability/src/CSVize.jl b/Stability/src/CSVize.jl
index f5ff1a5..795e3c6 100644
--- a/Stability/src/CSVize.jl
+++ b/Stability/src/CSVize.jl
@@ -29,11 +29,25 @@ struct ModuleStatsPerInstanceRecord
     line     :: Int
 end
 
-# Convert stats to vectors of records
+struct ModuleStatsInTypeRecord
+    modl     :: String
+    tyname   :: String
+    occurs   :: Int
+end
+
+#
+# Convert stats dicitonaries to vectors of records
+#
 modstats_table(ms :: ModuleStats, errio = stdout :: IO) ::
-    Tuple{Vector{ModuleStatsPerMethodRecord}, Vector{ModuleStatsPerInstanceRecord}} = begin
+    Tuple{
+        Vector{ModuleStatsPerMethodRecord},
+        Vector{ModuleStatsPerInstanceRecord},
+        Vector{ModuleStatsInTypeRecord}} = begin
+
         resmeth = []
         resmi = []
+        resty = []
+
         m2rettype = Dict{Method, Set{String}}()
         for (mi,cfgst) in ms.mistats
             try
@@ -84,5 +98,16 @@ modstats_table(ms :: ModuleStats, errio = stdout :: IO) ::
                 throw(err)
             end
         end
-        (resmeth,resmi)
+        for (ty,tystat) in ms.tystats
+            try
+                modl = "$(tystat.modl)"
+                tyname = "$(ty)"
+                push!(resty,
+                      ModuleStatsInTypeRecord(modl, tyname, tystat.occurs))
+            catch err
+                println(errio, "ERROR: modstats_table: ty-loop: $err");
+                throw(err)
+            end
+        end
+        (resmeth,resmi,resty)
 end
diff --git a/Stability/src/Stability.jl b/Stability/src/Stability.jl
index 0e5d27f..b6ea038 100644
--- a/Stability/src/Stability.jl
+++ b/Stability/src/Stability.jl
@@ -9,7 +9,7 @@ using Pkg
 using CSV
 
 export is_concrete_type, is_grounded_call, all_mis_of_module,
-       MIStats, MethodStats, ModuleStats,
+       MIStats, MethodStats, InTypeStats, ModuleStats,
        module_stats, modstats_summary, modstats_table,
        package_stats, cfg_stats,
        show_comma_sep
@@ -52,6 +52,7 @@ include("Utils.jl")
 #   * stability-errors.out
 #   * stability-stats-per-method.csv
 #   * stability-stats-per-instance.csv
+#   * stability-stats-intypes.csv
 #   * $pakg-version.txt (version stamp for future reference)
 #
 # Setting a package version:
@@ -114,6 +115,7 @@ package_stats(pakg :: String, ver = nothing) = begin
     #
     txtToCsv(work_dir, "stability-stats-per-method")
     txtToCsv(work_dir, "stability-stats-per-instance")
+    txtToCsv(work_dir, "stability-stats-intypes")
     @myinfo pkgtag "Results successfully converted to CSV. The package is DONE!"
 end
 
diff --git a/Stability/src/Stats.jl b/Stability/src/Stats.jl
index e1cce1b..2b7116a 100644
--- a/Stability/src/Stats.jl
+++ b/Stability/src/Stats.jl
@@ -49,7 +49,6 @@ is_return(::Any) = false
 
 # -------------------------------------------
 #
-#
 # Statistics gathered per method.
 #
 # -------------------------------------------
@@ -87,6 +86,23 @@ import Base.(+)
 show_comma_sep(xs::Vector) = join(xs, ",")
 
 
+# --------------------------------------------------------
+#
+# Statistics for all types occured during instantiations.
+#
+# --------------------------------------------------------
+
+# Note on "mutable": stats are only mutable during their calculation.
+@kwdef mutable struct InTypeStats
+    modl   :: String
+    occurs :: Int
+end
+
+InTypeStats(modl :: Module) = InTypeStats("$modl", 0)
+InTypeStats(modl :: String) = InTypeStats(modl, 0)
+
+@deriveEq(InTypeStats)
+
 # -------------------------------------------
 #
 # Statistics gathered per module.
@@ -97,9 +113,15 @@ show_comma_sep(xs::Vector) = join(xs, ",")
   modl    :: Module
   mestats :: Dict{Method, MethodStats}
   mistats :: Dict{MethodInstance, MIStats}
+  tystats :: Dict{Any, InTypeStats}
 end
 
-ModuleStats(modl :: Module) = ModuleStats(modl, Dict{Method, MethodStats}(), Dict{Method, MIStats}())
+ModuleStats(modl :: Module) = ModuleStats(
+    modl,
+    Dict{Method, MethodStats}(),
+    Dict{Method, MIStats}(),
+    Dict{Any, InTypeStats}()
+)
 
 @deriveEq(ModuleStats)
 
@@ -133,17 +155,20 @@ module_stats(modl :: Module, errio :: IO = stderr) = begin
     res = ModuleStats(modl)
     mis = all_mis_of_module(modl)
     for mi in mis
+
+        # Special cases: @generated, blocklisted
         if isdefined(mi.def, :generator) # can't handle @generated functions, Issue #11
             @debug "GENERATED $(mi)"
             continue
         end
-
         is_blocklisted(modl, mi.def.module) && (@debug "alien: $mi.def defined in $mi.def.module"; continue)
 
+        # Lookup method stats object for this `mi`
         fs = get!(res.mestats, mi.def,
                   fstats_default(mi.def.nospecialize,
                                  occursin("Vararg","$(mi.def.sig)")))
         try
+            # Get code of the `mi` for later analysis
             call = reconstruct_func_call(mi)
             if call === nothing # this mi is a constructor call - skip
                 delete!(res.mestats, mi.def)
@@ -152,7 +177,7 @@ module_stats(modl :: Module, errio :: IO = stderr) = begin
 
             fs.occurs += 1
 
-            # handle stability/groundedness
+            # Check stability/groundedness of the code
             mi_st = false
             mi_gd = false
             (code,rettype) = run_type_inference(call...);
@@ -165,8 +190,18 @@ module_stats(modl :: Module, errio :: IO = stderr) = begin
                 end
             end
 
-            # handle instance CFG stats
+            # Handle instance CFG stats
             res.mistats[mi] = MIStats(mi_st, mi_gd, cfg_stats(code)..., rettype, call[2] #= input types =#)
+
+            # Collect intypes
+            intypes = Base.unwrap_unionall(mi.specTypes).types[2:end]
+            for ty in intypes
+                tymodl = moduleChainOfType(ty)
+                tystat = get!(res.tystats,
+                            ty,
+                            InTypeStats(tymodl))
+                tystat.occurs += 1
+            end
         catch err
             fs.fail += 1
             print(errio, "ERROR: ");
diff --git a/Stability/src/Utils.jl b/Stability/src/Utils.jl
index b17e387..0070670 100644
--- a/Stability/src/Utils.jl
+++ b/Stability/src/Utils.jl
@@ -46,9 +46,19 @@ end
 
 txtToCsv(work_dir :: String, basename :: String) = begin
     resf = joinpath(work_dir, "$basename.txt")
-    isfile(resf) || (@error "Stability analysis failed to produce output $resf"; return)
+    isfile(resf) || (throw(ErrorException("Stability analysis failed to produce output $resf")))
     st =
         eval(Meta.parse(
             open(f-> read(f,String), resf,"r")))
     CSV.write(joinpath(work_dir, "$basename.csv"), st)
 end
+
+moduleChainOfType(@nospecialize(ty)) :: String = begin
+    mod=parentmodule(ty)
+    res="$mod"
+    while parentmodule(ty) != mod
+        mod = parentmodule(mod)
+        res = "$mod." * res
+    end
+    res
+end
diff --git a/Stability/src/pkg-test-override.jl b/Stability/src/pkg-test-override.jl
index c31a671..998cc8c 100644
--- a/Stability/src/pkg-test-override.jl
+++ b/Stability/src/pkg-test-override.jl
@@ -49,7 +49,8 @@ function Pkg.Operations.gen_test_code(testfile::String;
           open(out -> println(out, pakg * "," * show_comma_sep(summary)), joinpath(wdir, "stability-summary.out"), "w")
 
           @info "[Stability] [Package: " * pakg * "] Constructing a table from the stats..."
-          (methst, mist) = modstats_table(ms)
+          (methst, mist, tyt) = modstats_table(ms)
+
           @info "[Stability] [Package: " * pakg * "] Table size (per method): " * string(length(methst))
           outf = joinpath(wdir, "stability-stats-per-method.txt")
           @info "[Stability] [Package: " * pakg * "] About to store per method results to: " * outf
@@ -59,6 +60,11 @@ function Pkg.Operations.gen_test_code(testfile::String;
           outf = joinpath(wdir, "stability-stats-per-instance.txt")
           @info "[Stability] [Package: " * pakg * "] About to store per instance results to: " * outf
           open(f-> println(f,mist), outf,"w")
+
+          @info "[Stability] [Package: " * pakg * "] Table size (types): " * string(length(tyt))
+          outf = joinpath(wdir, "stability-stats-intypes.txt")
+          @info "[Stability] [Package: " * pakg * "] About to store intypes to: " * outf
+          open(f-> println(f,tyt), outf,"w")
         end
         @info "[Stability] [Package: " * pakg * "] Finish testing + analysis"
         #### End
diff --git a/Stability/test/runtests.jl b/Stability/test/runtests.jl
index 214ead0..638d62e 100644
--- a/Stability/test/runtests.jl
+++ b/Stability/test/runtests.jl
@@ -22,5 +22,6 @@ finst=fmeth.specializations[1]
     ModuleStats(M,
                 Dict(fmeth=>MethodStats(; occurs=1, stable=1, grounded=1, nospec=0, vararg=0, fail=0)),
                 Dict(finst=>MIStats(; st=1, gd=1, gt=0, rt=0, rettype=Int64, intypes=Core.svec(Int64))),
+                Dict(Int64=>InTypeStats("Core", 1)),
                 )
 end