diff --git a/ddl/templates/versions/8/fixtures.sql b/ddl/templates/versions/8/fixtures.sql
index 3c1b7a37a6..ba88dc4a87 100644
--- a/ddl/templates/versions/8/fixtures.sql
+++ b/ddl/templates/versions/8/fixtures.sql
@@ -9,19 +9,21 @@ VALUES ('Core', 'Homozygous - Core'),
        ('Cre BAC', 'EUCOMMTools-Cre BAC'),
        ('Human','Homozygous - Human');
 
-INSERT INTO mutation_type(mutation_type)
+INSERT INTO mutation_types(mutation_type)
 VALUES ('conditional'),
        ('deletion'),
        ('insertion');
 
-INSERT INTO targeting_type(targeting_type)
+INSERT INTO targeting_types(targeting_type)
 VALUES ('single_targeting'),
        ('double_targeting'),
        ('modified_bac_insertion');
 
-INSERT INTO final_cassette_function(final_cassette_function)
+INSERT INTO cassette_functions(final_cassette_function)
 VALUES ('knockout_first'),
        ('reporter_only'),
        ('conditional_only'),
        ('cre_expressor'),
        ('promoterless_cre_expressor');
+
+[% FOR cassette IN        
diff --git a/ddl/templates/versions/8/up.sql b/ddl/templates/versions/8/up.sql
index 280961be2b..0f19b39abc 100644
--- a/ddl/templates/versions/8/up.sql
+++ b/ddl/templates/versions/8/up.sql
@@ -9,23 +9,34 @@ CREATE TABLE sponsors (
 GRANT SELECT ON sponsors TO "[% ro_role %]";
 GRANT SELECT, INSERT, UPDATE, DELETE ON sponsors TO "[% rw_role %]";
 
-CREATE TABLE mutation_type (
+-- XXX at the very least, need unique key on mutation_type, targeting_type, cassette_function
+-- Should we dispense with the SERIAL id column on these tables?
+
+CREATE TABLE mutation_types (
        id            SERIAL PRIMARY KEY,
        mutation_type TEXT NOT NULL
 );
-GRANT SELECT ON mutation_type TO "[% ro_role %]";
-GRANT SELECT, INSERT, UPDATE, DELETE ON mutation_type TO "[% rw_role %]";       
+GRANT SELECT ON mutation_types TO "[% ro_role %]";
+GRANT SELECT, INSERT, UPDATE, DELETE ON mutation_types TO "[% rw_role %]";       
 
-CREATE TABLE targeting_type (
+CREATE TABLE targeting_types (
        id             SERIAL PRIMARY KEY,
        targeting_type TEXT NOT NULL
 );
-GRANT SELECT ON targeting_type TO "[% ro_role %]";
-GRANT SELECT, INSERT, UPDATE, DELETE ON targeting_type TO "[% rw_role %]";
+GRANT SELECT ON targeting_types TO "[% ro_role %]";
+GRANT SELECT, INSERT, UPDATE, DELETE ON targeting_types TO "[% rw_role %]";
+
+CREATE TABLE cassette_functions (
+       id                SERIAL PRIMARY KEY,
+       cassette_function TEXT NOT NULL
+);
+GRANT SELECT ON cassette_functions TO "[% ro_role %]";
+GRANT SELECT, INSERT, UPDATE, DELETE ON cassette_functions TO "[% rw_role %]";
 
-CREATE TABLE final_cassette_function (
-       id                      SERIAL PRIMARY KEY,
-       final_cassette_function TEXT NOT NULL
+CREATE TABLE cassette_cassette_functions (
+       cassette_id INTEGER NOT NULL REFERENCES cassettes(id),
+       function_id INTEGER NOT NULL REFERENCES cassette_functions(id),
+       PRIMARY KEY(cassette_id,function_id)
 );
-GRANT SELECT ON final_cassette_function TO "[% ro_role %]";
-GRANT SELECT, INSERT, UPDATE, DELETE ON final_cassette_function TO "[% rw_role %]";
+GRANT SELECT ON cassette_cassette_functions TO "[% ro_role %]";
+GRANT SELECT, INSERT, UPDATE, DELETE ON cassette_cassette_functions TO "[% rw_role %]";
diff --git a/lib/LIMS2/AlleleRequest.pm b/lib/LIMS2/AlleleRequest.pm
new file mode 100644
index 0000000000..1c0f70e339
--- /dev/null
+++ b/lib/LIMS2/AlleleRequest.pm
@@ -0,0 +1,89 @@
+package LIMS2::AlleleRequest;
+
+use strict;
+use warnings FATAL => 'all';
+
+use Moose;
+use MooseX::ClassAttribute;
+use List::MoreUtils qw( any );
+use namespace::autoclean;
+
+class_has handled_targeting_types => (
+    is      => 'ro',
+    isa     => 'ArrayRef[Str]',
+    default => sub { [] }
+);
+
+sub handles {
+    my ( $class, $targeting_type ) = @_;
+
+    return any { $_ eq $targeting_type } @{ $class->handled_targeting_types };
+}
+
+has model => (
+    is       => 'ro',
+    isa      => 'LIMS2::Model',
+    required => 1
+);
+
+has [ qw( species gene_id ) ] => ( 
+    is => 'ro',
+    isa => 'Str',
+    required => 1
+);
+
+sub _build_designs {
+    my ( $self, $mutation_type ) = @_;
+
+    return $self->model->list_assigned_designs_for_gene(
+        {
+            species => $self->species,
+            gene_id => $self->gene_id,
+            type    => $self->design_types_for( $mutation_type )
+        }
+    );
+}
+
+## no critic(RequireFinalReturn)
+sub design_types_for {
+    my ( $self, $mutation_type ) = @_;
+
+    if ( $mutation_type eq 'ko first' ) {
+        return [ 'conditional', 'artificial-intron', 'intron-replacement' ];
+    }
+
+    $self->model->throw( Implementation => "Unrecognized mutation type: $mutation_type" );    
+}
+## use critic
+
+sub design_wells {
+    my ( $self, $design ) = @_;
+    return map { $_->output_wells } $design->process_designs_rs->search_related( process => { type_id => 'create_di' } );
+}
+
+    
+
+# Input:
+#
+# gene_id: Snf8 ( MGI:1343161 )
+# targeting type: double targeting
+# first allele Mutation type: ko first
+# first allele cassette function: ko first
+# second allele mutation type: conditional
+# second allele cassette function: reporter only (conditional + cre)
+
+# Output:
+#
+# Designs
+# Design wells
+# Final vector wells for 1st allele
+# Final vector wells for 2nd allele
+# First EP
+# Second EP
+
+__PACKAGE__->meta->make_immutable;
+
+1;
+
+__END__
+
diff --git a/lib/LIMS2/AlleleRequest/DoubleTargeted.pm b/lib/LIMS2/AlleleRequest/DoubleTargeted.pm
new file mode 100644
index 0000000000..64a07ac76a
--- /dev/null
+++ b/lib/LIMS2/AlleleRequest/DoubleTargeted.pm
@@ -0,0 +1,69 @@
+package LIMS2::AlleleRequest::DoubleTargeted;
+
+use strict;
+use warnings FATAL => 'all';
+
+use Moose;
+use MooseX::ClassAttribute;
+use namespace::autoclean;
+
+extends qw( LIMS2::AlleleRequest );
+
+class_has '+handled_targeting_types' => (
+    default => sub { [ 'double_targeted' ] }
+);
+
+has [ qw( first_allele_mutation_type first_allele_cassette_function second_allele_mutation_type second_allele_cassette_function ) ] => (
+    is => 'ro',
+    isa => 'Str',
+    required => 1
+);
+
+has [ qw( first_allele_designs second_allele_designs ) ] => (
+    is         => 'ro',
+    isa        => 'ArrayRef[LIMS2::Model::Schema::Result::Design]',
+    init_arg   => undef,
+    lazy_build => 1
+);
+
+sub _build_first_allele_designs {
+    my $self = shift;
+    return $self->_build_designs( $self->first_allele_mutation_type );
+}
+
+sub _build_second_allele_designs {
+    my $self = shift;
+    return $self->_build_designs( $self->second_allele_mutation_type );
+}
+
+has [
+    qw( first_allele_design_wells second_allele_design_wells
+        first_allele_final_vector_wells second_allele_final_vector_wells
+  )
+] => (
+    is         => 'ro',
+    isa        => 'ArrayRef[LIMS2::Model::Schema::Result::Well]',
+    init_arg   => undef,
+    lazy_build => 1
+);
+
+sub _build_first_allele_design_wells {
+    my $self = shift;
+    [ map { $self->design_wells($_) } @{$self->first_allele_designs} ];
+}
+
+sub _build_second_allele_design_wells {
+    my $self = shift;
+    [ map { $self->design_wells($_) } @{$self->second_allele_designs} ];
+}
+
+sub _build_first_allele_final_vector_wells {
+    my $self = shift;
+    
+}
+
+__PACKAGE__->meta->make_immutable;
+
+1;
+
+__END__
diff --git a/lib/LIMS2/AlleleRequestFactory.pm b/lib/LIMS2/AlleleRequestFactory.pm
new file mode 100644
index 0000000000..411e34a5fb
--- /dev/null
+++ b/lib/LIMS2/AlleleRequestFactory.pm
@@ -0,0 +1,54 @@
+package LIMS2::AlleleRequestFactory;
+
+use strict;
+use warnings FATAL => 'all';
+
+use Moose;
+use Module::Pluggable::Object;
+use LIMS2::Exception::Implementation;
+use namespace::autoclean;
+
+has model => (
+    is       => 'ro',
+    isa      => 'LIMS2::Model',
+    required => 1
+);
+
+has species => ( 
+    is       => 'ro',
+    isa      => 'Str',
+    required => 1
+);
+
+sub plugins {
+    my $self = shift;
+    return Module::Pluggable::Object->new( search_path => 'LIMS2::AlleleRequest', require => 1 )->plugins;
+}
+
+## no critic(RequireFinalReturn)
+sub allele_request {
+    my ( $self, %params ) = @_;
+
+    my $targeting_type = delete $params{targeting_type}
+        or LIMS2::Exception::Implementation->throw( "allele_request() requires targeting_type" );
+
+    $params{model}   ||= $self->model;
+    $params{species} ||= $self->species;
+
+    for my $plugin ( $self->plugins ) {
+        if ( $plugin->handles( $targeting_type ) ) {
+            return $plugin->new( \%params );
+        }
+    }
+
+    LIMS2::Exception::Implementation->throw( "Allele request targeting type '$targeting_type' not recognized" );
+}
+## use critic
+
+__PACKAGE__->meta->make_immutable;
+
+1;
+
+__END__
+
+
diff --git a/t/60-allele-request.t b/t/60-allele-request.t
new file mode 100755
index 0000000000..e7b4d5d062
--- /dev/null
+++ b/t/60-allele-request.t
@@ -0,0 +1,59 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings FATAL => 'all';
+
+#use LIMS2::Test;
+use Test::Most;
+use LIMS2::AlleleRequestFactory;
+
+# XXX Naughty hack, we should really use LIMS2::Test
+{
+    require LIMS2::Model;
+
+    my $model;
+    
+    sub model {
+        return $model ||= LIMS2::Model->new( { user => 'tasks' } );
+    }
+}
+
+ok my $arf = LIMS2::AlleleRequestFactory->new( model => model(), species => 'Mouse' ),
+    'create allele request factory';
+
+isa_ok $arf, 'LIMS2::AlleleRequestFactory';
+
+throws_ok { $arf->allele_request() }
+    qr/\Qallele_request() requires targeting_type\E/, 'allele_request requires targeting_type';
+
+ok my $ar = $arf->allele_request(
+    gene_id                         => 'MGI:1343161',
+    targeting_type                  => 'double_targeted',
+    first_allele_mutation_type      => 'ko first',
+    first_allele_cassette_function  => 'ko first',
+    second_allele_mutation_type     => 'ko first',
+    second_allele_cassette_function => 'reporter only'
+), 'constructor succeeds';
+
+my $first_allele_designs;
+lives_ok { $first_allele_designs = $ar->first_allele_designs } 'first_allele_designs succeeds';
+cmp_bag [ map { $_->id } @{$first_allele_designs} ], [ 76 ], 'first_allele_designs returns expected result';
+
+my $second_allele_designs;
+lives_ok { $second_allele_designs = $ar->second_allele_designs } 'second_allele_designs succeeds';
+cmp_bag [ map { $_->id } @{$second_allele_designs} ], [ 76 ], 'second_allele_designs returns expected result';
+
+my $first_allele_design_wells;
+lives_ok { $first_allele_design_wells = $ar->first_allele_design_wells } 'first_allele_design_wells succeeds';
+cmp_bag [ map { $_->as_string } @{$first_allele_design_wells} ], [ '4_C04', '34_C04' ], 'first_allele_design_wells returns the expected result';
+
+my $second_allele_design_wells;
+lives_ok { $second_allele_design_wells = $ar->second_allele_design_wells } 'second_allele_design_wells succeeds';
+cmp_bag [ map { $_->as_string } @{$second_allele_design_wells} ], [ '4_C04', '34_C04' ], 'second_allele_design_wells returns the expected result';
+
+    
+
+
+
+
+done_testing();