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diff --git a/evaluator/evaluator.py b/evaluator/evaluator.py
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+++ b/evaluator/evaluator.py
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+"""
+The evaluator.py module contains a single Evaluator class,
+which knows all the attributes of a specified Aircraft instance,
+and contains functions to analyse the airfoil's geometrical
+& structural properties.
+"""
+
+import sys
+import os.path
+import matplotlib.pyplot as plt
+import concurrent.futures
+import logging
+
+from . import drag, inertia, lift, mass
+import generator
+
+logging.basicConfig(filename='log_eval.txt',
+                    level=logging.DEBUG,
+                    format='%(asctime)s - %(levelname)s - %(message)s')
+
+
+class Evaluator:
+    """Performs structural evaluations on aircrafts.
+    Individual aircrafts must claim an Evaluator object as parent."""
+    def __init__(self, name):
+        self.name = name
+        self.aircrafts = []
+        self.results = []
+
+        self.I_ = {'x': 0, 'z': 0, 'xz': 0}
+
+    def analyze(self, aircraft):
+        """Analyze a single aircraft."""
+        aircraft.results.update({'Lift': lift.get_lift_total(aircraft)})
+        aircraft.results.update({'Drag': drag.get_drag_total(aircraft)})
+        aircraft.results.update({'Mass': mass.get_mass_total(aircraft)})
+        aircraft.results.update({'Centroid': inertia.get_centroid(aircraft)})
+        return aircraft.results
+
+    def analyze_all(self):
+        """Perform all analysis calculations on a all aircraft in evaluator."""
+        with concurrent.futures.ProcessPoolExecutor() as executor:
+            executor.map(self.analyze, self.aircrafts)
+
+        return None
+
+    # def analysis(self, V_x, V_z):
+    #     """Perform all analysis calculations and store in class instance."""
+
+    #     self.drag = self.get_drag(10)
+    #     self.lift_rectangular = self.get_lift_rectangular(13.7)
+    #     self.lift_elliptical = self.get_lift_elliptical(15)
+    #     self.lift_total = self.get_lift_total()
+    #     self.mass_dist = self.get_mass_distribution(self.mass_total)
+    #     self.centroid = self.get_centroid()
+    #     self.I_['x'] = self.get_inertia_terms()[0]
+    #     self.I_['z'] = self.get_inertia_terms()[1]
+    #     self.I_['xz'] = self.get_inertia_terms()[2]
+    #     spar_dx = self.get_dx(self.spar)
+    #     spar_dz = self.get_dz(self.spar)
+    #     self.spar.dP_x = self.get_dP(spar_dx, spar_dz, V_x, 0,
+    #                                  self.spar.cap_area)
+    #     self.spar.dP_z = self.get_dP(spar_dx, spar_dz, 0, V_z,
+    #                                  self.spar.cap_area)
+    #     print("yayyyyy")
+    #     return None
+
+    # print(f"Analysis results for {aircraft.name}:\n", results)
+    # self.results = self.get_lift_total(aircraft)
+
+    # self.drag = self.get_drag(10)
+    # self.lift_rectangular = self.get_lift_rectangular(13.7)
+    # self.lift_elliptical = self.get_lift_elliptical(15)
+    # self.lift_total = self.get_lift_total()
+    # self.mass_dist = self.get_mass_distribution(self.mass_total)
+    # self.centroid = self.get_centroid()
+    # self.I_['x'] = self.get_inertia_terms()[0]
+    # self.I_['z'] = self.get_inertia_terms()[1]
+    # self.I_['xz'] = self.get_inertia_terms()[2]
+    # spar_dx = self.get_dx(self.spar)
+    # spar_dz = self.get_dz(self.spar)
+    # self.spar.dP_x = self.get_dP(spar_dx, spar_dz, V_x, 0,
+    #                              self.spar.cap_area)
+    # self.spar.dP_z = self.get_dP(spar_dx, spar_dz, 0, V_z,
+    #                              self.spar.cap_area)
+    # return None
+
+    def tree_print(self, *aircrafts):
+        """Print the list of subcomponents."""
+        name = f"    TREE FOR {[i.name for i in aircrafts]} IN {self.name}    "
+        num_of_dashes = len(name)
+        print(num_of_dashes * '-')
+        print(name)
+        for aircraft in aircrafts:
+            print(".")
+            print(f"`-- {aircraft}")
+            print(f"    |--{aircraft.wing}")
+            print(f"    |   |-- {aircraft.wing.stringers}")
+            for spar in aircraft.wing.spars[:-1]:
+                print(f"    |   |-- {spar}")
+            print(f"    |   `-- {aircraft.wing.spars[-1]}")
+            print(f"    |-- {aircraft.fuselage}")
+            print(f"    `-- {aircraft.propulsion}")
+        print(num_of_dashes * '-')
+        return None
+
+    def tree_save(self,
+                  *aircrafts,
+                  save_path='/home/blendux/Projects/Aircraft_Studio/save'):
+        """Save the evaluator's tree to a file."""
+        for aircraft in aircrafts:
+            file_name = f"{aircraft.name}_tree.txt"
+            full_path = os.path.join(save_path, file_name)
+            with open(full_path, 'w') as f:
+                try:
+                    f.write(".\n")
+                    f.write(f"`-- {aircraft}\n")
+                    f.write(f"    |--{aircraft.wing}\n")
+                    for spar in aircraft.wing.spars[:-1]:
+                        f.write(f"    |   |-- {spar}\n")
+                    f.write(f"    |   `-- {aircraft.wing.spars[-1]}\n")
+                    f.write(f"    |-- {aircraft.fuselage}\n")
+                    f.write(f"    `-- {aircraft.propulsion}\n")
+                    logging.debug(f'Successfully wrote to file {full_path}')
+
+                except IOError:
+                    print(
+                        f'Unable to write {file_name} to specified directory.',
+                        'Was the full path passed to the function?')
+        return None
+
+
+def plot_geom(evaluator):
+    """This function plots analysis results over the airfoil's geometry."""
+    # Plot chord
+    x_chord = [0, evaluator.chord]
+    y_chord = [0, 0]
+    plt.plot(x_chord, y_chord, linewidth='1')
+    # Plot quarter chord
+    plt.plot(evaluator.chord / 4,
+             0,
+             '.',
+             color='g',
+             markersize=24,
+             label='Quarter-chord')
+    # Plot airfoil surfaces
+    x = [0.98 * x for x in evaluator.airfoil.x]
+    y = [0.98 * z for z in evaluator.airfoil.z]
+    plt.fill(x, y, color='w', linewidth='1', fill=False)
+    x = [1.02 * x for x in evaluator.airfoil.x]
+    y = [1.02 * z for z in evaluator.airfoil.z]
+    plt.fill(x, y, color='b', linewidth='1', fill=False)
+
+    # Plot spars
+    try:
+        for _ in range(len(evaluator.spar.x)):
+            x = (evaluator.spar.x[_])
+            y = (evaluator.spar.z[_])
+            plt.plot(x, y, '-', color='b')
+    except AttributeError:
+        print('No spars to plot.')
+    # Plot stringers
+    try:
+        for _ in range(0, len(evaluator.stringer.x)):
+            x = evaluator.stringer.x[_]
+            y = evaluator.stringer.z[_]
+            plt.plot(x, y, '.', color='y', markersize=12)
+    except AttributeError:
+        print('No stringers to plot.')
+
+    # Plot centroid
+    x = evaluator.centroid[0]
+    y = evaluator.centroid[1]
+    plt.plot(x, y, '.', color='r', markersize=24, label='centroid')
+
+    # Graph formatting
+    plt.xlabel('X axis')
+    plt.ylabel('Z axis')
+
+    plot_bound = max(evaluator.airfoil.x)
+    plt.xlim(-0.10 * plot_bound, 1.10 * plot_bound)
+    plt.ylim(-(1.10 * plot_bound / 2), (1.10 * plot_bound / 2))
+    plt.gca().set_aspect('equal', adjustable='box')
+    plt.gca().legend()
+    plt.grid(axis='both', linestyle=':', linewidth=1)
+    plt.show()
+    return None
+
+
+def plot_lift(evaluator):
+    x = range(evaluator.semi_span)
+    y_1 = evaluator.lift_rectangular
+    y_2 = evaluator.lift_elliptical
+    y_3 = evaluator.lift_total
+    plt.plot(x, y_1, '.', color='b', markersize=4, label='Rectangular lift')
+    plt.plot(x, y_2, '.', color='g', markersize=4, label='Elliptical lift')
+    plt.plot(x, y_3, '.', color='r', markersize=4, label='Total lift')
+
+    # Graph formatting
+    plt.xlabel('Semi-span location')
+    plt.ylabel('Lift')
+
+    plt.gca().legend()
+    plt.grid(axis='both', linestyle=':', linewidth=1)
+    plt.show()
+    return None