diff --git a/spec/models/budget/ballot/line_spec.rb b/spec/models/budget/ballot/line_spec.rb
index 885998eb1..7ce4dcbf7 100644
--- a/spec/models/budget/ballot/line_spec.rb
+++ b/spec/models/budget/ballot/line_spec.rb
@@ -6,7 +6,7 @@ describe "Budget::Ballot::Line" do
     let(:budget){ create(:budget) }
     let(:group){ create(:budget_group, budget: budget) }
     let(:heading){ create(:budget_heading, group: group, price: 10000000) }
-    let(:investment){ create(:budget_investment, :feasible, price: 5000000, heading: heading) }
+    let(:investment){ create(:budget_investment, :selected, price: 5000000, heading: heading) }
     let(:ballot) { create(:budget_ballot, budget: budget) }
     let(:ballot_line) { build(:budget_ballot_line, ballot: ballot, investment: investment) }
 
@@ -29,19 +29,14 @@ describe "Budget::Ballot::Line" do
       end
     end
 
-    describe 'Feasibility' do
-      it "should not be valid if investment is unfeasible" do
-        investment.update(feasibility: "unfeasible")
+    describe 'Selectibility' do
+      it "should not be valid if investment is unselected" do
+        investment.update(selected: false)
         expect(ballot_line).to_not be_valid
       end
 
-      it "should not be valid if investment feasibility is undecided" do
-        investment.update(feasibility: "undecided", price: 20000)
-        expect(ballot_line).to_not be_valid
-      end
-
-      it "should be valid if investment is feasible" do
-        investment.update(feasibility: "feasible", price: 20000)
+      it "should be valid if investment is selected" do
+        investment.update(selected: true, price: 20000)
         expect(ballot_line).to be_valid
       end
     end
diff --git a/spec/models/budget/ballot_spec.rb b/spec/models/budget/ballot_spec.rb
index 97fa966fc..e99a2276d 100644
--- a/spec/models/budget/ballot_spec.rb
+++ b/spec/models/budget/ballot_spec.rb
@@ -9,15 +9,15 @@ describe Budget::Ballot do
       group2 = create(:budget_group, budget: budget)
       heading1 = create(:budget_heading, group: group1, price: 100000)
       heading2 = create(:budget_heading, group: group2, price: 200000)
-      inv1 = create(:budget_investment, :feasible, price: 10000, heading: heading1)
-      inv2 = create(:budget_investment, :feasible, price: 20000, heading: heading2)
+      inv1 = create(:budget_investment, :selected, price: 10000, heading: heading1)
+      inv2 = create(:budget_investment, :selected, price: 20000, heading: heading2)
 
       ballot = create(:budget_ballot, budget: budget)
-      ballot.add_investment inv1
+      ballot.investments << inv1
 
       expect(ballot.total_amount_spent).to eq 10000
 
-      ballot.add_investment inv2
+      ballot.investments << inv2
 
       expect(ballot.total_amount_spent).to eq 30000
     end
@@ -25,17 +25,16 @@ describe Budget::Ballot do
     it "returns the amount spent on all investments assigned to a specific heading" do
       heading = create(:budget_heading)
       budget = heading.group.budget
-      inv1 = create(:budget_investment, :feasible, price: 10000, heading: heading)
-      inv2 = create(:budget_investment, :feasible, price: 20000, heading: create(:budget_heading, group: heading.group))
-      inv3 = create(:budget_investment, :feasible, price: 40000, heading: heading)
+      inv1 = create(:budget_investment, :selected, price: 10000, heading: heading)
+      inv2 = create(:budget_investment, :selected, price: 20000, heading: create(:budget_heading, group: heading.group))
+      inv3 = create(:budget_investment, :selected, price: 40000, heading: heading)
 
       ballot = create(:budget_ballot, budget: budget)
-      ballot.add_investment inv1
-      ballot.add_investment inv2
+      ballot.investments << inv1 << inv2
 
       expect(ballot.amount_spent(heading)).to eq 10000
 
-      ballot.add_investment inv3
+      ballot.investments << inv3
 
       expect(ballot.amount_spent(heading)).to eq 50000
     end
@@ -47,18 +46,17 @@ describe Budget::Ballot do
       group = create(:budget_group, budget: budget)
       heading1 = create(:budget_heading, group: group, price: 1000)
       heading2 = create(:budget_heading, group: group, price: 300)
-      inv1 = create(:budget_investment, :feasible, price: 100, heading: heading1)
-      inv2 = create(:budget_investment, :feasible, price: 200, heading: heading2)
-      inv3 = create(:budget_investment, :feasible, price: 400, heading: heading1)
+      inv1 = create(:budget_investment, :selected, price: 100, heading: heading1)
+      inv2 = create(:budget_investment, :selected, price: 200, heading: heading2)
+      inv3 = create(:budget_investment, :selected, price: 400, heading: heading1)
 
       ballot = create(:budget_ballot, budget: budget)
-      ballot.add_investment inv1
-      ballot.add_investment inv2
+      ballot.investments << inv1 << inv2
 
       expect(ballot.amount_available(heading1)).to eq 900
       expect(ballot.amount_available(heading2)).to eq 100
 
-      ballot.add_investment inv3
+      ballot.investments << inv3
 
       expect(ballot.amount_available(heading1)).to eq 500
     end
diff --git a/spec/models/budget/investment_spec.rb b/spec/models/budget/investment_spec.rb
index 6b98025ad..a56cfe46e 100644
--- a/spec/models/budget/investment_spec.rb
+++ b/spec/models/budget/investment_spec.rb
@@ -338,23 +338,23 @@ describe Budget::Investment do
           california = create(:budget_heading, group: group)
           new_york = create(:budget_heading, group: group)
 
-          inv1 = create(:budget_investment, :feasible, budget: budget, group: group, heading: california)
-          inv2 = create(:budget_investment, :feasible, budget: budget, group: group, heading: new_york)
-          b = create(:budget_ballot, user: user, budget: budget)
-          b.add_investment inv1
+          inv1 = create(:budget_investment, :selected, budget: budget, group: group, heading: california)
+          inv2 = create(:budget_investment, :selected, budget: budget, group: group, heading: new_york)
+          ballot = create(:budget_ballot, user: user, budget: budget)
+          ballot.investments << inv1
 
-          expect(inv2.reason_for_not_being_ballotable_by(user, b)).to eq(:different_heading_assigned)
+          expect(inv2.reason_for_not_being_ballotable_by(user, ballot)).to eq(:different_heading_assigned)
         end
 
         it "rejects proposals with price higher than current available money" do
           budget.phase = "balloting"
           districts = create(:budget_group, budget: budget)
           carabanchel = create(:budget_heading, group: districts, price: 35)
-          inv1 = create(:budget_investment, :feasible, budget: budget, group: districts, heading: carabanchel, price: 30)
-          inv2 = create(:budget_investment, :feasible, budget: budget, group: districts, heading: carabanchel, price: 10)
+          inv1 = create(:budget_investment, :selected, budget: budget, group: districts, heading: carabanchel, price: 30)
+          inv2 = create(:budget_investment, :selected, budget: budget, group: districts, heading: carabanchel, price: 10)
 
           ballot = create(:budget_ballot, user: user, budget: budget)
-          ballot.add_investment inv1
+          ballot.investments << inv1
 
           expect(inv2.reason_for_not_being_ballotable_by(user, ballot)).to eq(:not_enough_money)
         end