diff --git a/opm/core/InjectionSpecification.cpp b/opm/core/InjectionSpecification.cpp
new file mode 100644
index 000000000..2d6cf7693
--- /dev/null
+++ b/opm/core/InjectionSpecification.cpp
@@ -0,0 +1,62 @@
+#include <opm/core/InjectionSpecification.hpp>
+namespace Opm {
+
+InjectionSpecification::InjectionSpecification()
+: component_(WATER), control_mode_(NONE), surface_injection_target_(0.0),
+reinjection_fraction_target_(0.0), BHP_target_(0.0) {
+
+}
+
+InjectionSpecification::InjectionSpecification(const InjectionSpecification& orig) {
+}
+
+InjectionSpecification::~InjectionSpecification() {
+}
+
+InjectionSpecification::Component InjectionSpecification::component() {
+    return component_;
+}
+
+void InjectionSpecification::set_component(InjectionSpecification::Component comp) {
+    component_ = comp;
+}
+
+InjectionSpecification::ControlMode InjectionSpecification::control_mode() {
+    return control_mode_;
+}
+
+void InjectionSpecification::set_control_mode(InjectionSpecification::ControlMode mode) {
+    control_mode_ = mode;
+}
+
+/// \returns 0 if no limit, else the target/limit of the surface Injector 
+///          rate.
+double InjectionSpecification::surface_injection_target() {
+    return surface_injection_target_;
+}
+
+void InjectionSpecification::set_surface_injection_target(double target) {
+    surface_injection_target_ = target;
+}
+
+/// \returns 0 if no limit, else the target/limit of the reInjector fraction
+
+double InjectionSpecification::reinjection_fraction_target() {
+    return reinjection_fraction_target_;
+}
+
+void InjectionSpecification::set_reinjection_fraction_target(double target) {
+    reinjection_fraction_target_ = target;
+}
+
+/// \returns 0 if no limit, else the target/limit of the BHP
+
+double InjectionSpecification::BHP_target() {
+    return BHP_target_;
+}
+
+void InjectionSpecification::set_BHP_target(double target) {
+    BHP_target_ = target;
+}
+
+} // namespace Opm
\ No newline at end of file
diff --git a/opm/core/InjectionSpecification.hpp b/opm/core/InjectionSpecification.hpp
new file mode 100644
index 000000000..728df76aa
--- /dev/null
+++ b/opm/core/InjectionSpecification.hpp
@@ -0,0 +1,47 @@
+#ifndef OPM_INJECTORSPECIFICATION_HPP
+#define	OPM_INJECTORSPECIFICATION_HPP
+
+namespace Opm {
+
+class InjectionSpecification {
+public:
+    enum Component {
+        GAS, OIL, WATER
+    };
+    
+    enum ControlMode {
+        NONE, RATE, REIN, RESV, VREP, WGRA, FLD
+    };
+    
+    InjectionSpecification();
+    InjectionSpecification(const InjectionSpecification& orig);
+    virtual ~InjectionSpecification();
+    
+    Component component();
+    void set_component(Component comp);
+    
+    ControlMode control_mode();
+    void set_control_mode(ControlMode mode);
+    
+    /// \returns 0 if no limit, else the target/limit of the surface injection 
+    ///          rate.
+    double surface_injection_target();
+    void set_surface_injection_target(double target);
+    
+    /// \returns 0 if no limit, else the target/limit of the reinjection fraction
+    double reinjection_fraction_target();
+    void set_reinjection_fraction_target(double target);
+    
+    /// \returns 0 if no limit, else the target/limit of the BHP
+    double BHP_target();
+    void set_BHP_target(double target);
+private:
+    Component component_;
+    ControlMode control_mode_;
+    double surface_injection_target_;
+    double reinjection_fraction_target_;
+    double BHP_target_;
+};
+}
+#endif	/* OPM_INJECTORSPECIFICATION_HPP */
+
diff --git a/opm/core/ProductionSpecification.cpp b/opm/core/ProductionSpecification.cpp
new file mode 100644
index 000000000..0d0b7109a
--- /dev/null
+++ b/opm/core/ProductionSpecification.cpp
@@ -0,0 +1,73 @@
+#include <opm/core/ProductionSpecification.hpp>
+
+namespace Opm { 
+ProductionSpecification::ProductionSpecification() : 
+        component_(OIL),
+        control_mode_(NONE_CM),
+        procedure_(NONE_P),
+        oil_production_target_(-1.0),
+        water_production_target_(-1.0),
+        liquid_production_target_(-1.0),
+        BHP_target_(-1.0)
+{
+}
+
+ProductionSpecification::~ProductionSpecification() {
+}
+
+void ProductionSpecification::set_BHP_target(double BHP_target_) {
+    this->BHP_target_ = BHP_target_;
+}
+
+double ProductionSpecification::get_BHP_target() const {
+    return BHP_target_;
+}
+
+void ProductionSpecification::set_liquid_production_target(double liquid_production_target_) {
+    this->liquid_production_target_ = liquid_production_target_;
+}
+
+double ProductionSpecification::get_liquid_production_target() const {
+    return liquid_production_target_;
+}
+
+void ProductionSpecification::set_water_production_target(double water_production_target_) {
+    this->water_production_target_ = water_production_target_;
+}
+
+double ProductionSpecification::get_water_production_target() const {
+    return water_production_target_;
+}
+
+void ProductionSpecification::set_oil_production_target(double oil_production_target_) {
+    this->oil_production_target_ = oil_production_target_;
+}
+
+double ProductionSpecification::get_oil_production_target() const {
+    return oil_production_target_;
+}
+
+void ProductionSpecification::set_procedure(ProductionSpecification::Procedure procedure_) {
+    this->procedure_ = procedure_;
+}
+
+ProductionSpecification::Procedure ProductionSpecification::get_procedure() const {
+    return procedure_;
+}
+
+void ProductionSpecification::set_control_mode(ProductionSpecification::ControlMode control_mode_) {
+    this->control_mode_ = control_mode_;
+}
+
+ProductionSpecification::ControlMode ProductionSpecification::get_control_mode() const {
+    return control_mode_;
+}
+
+void ProductionSpecification::set_component(ProductionSpecification::Component component_) {
+    this->component_ = component_;
+}
+
+ProductionSpecification::Component ProductionSpecification::get_component() const {
+    return component_;
+}
+}
diff --git a/opm/core/ProductionSpecification.hpp b/opm/core/ProductionSpecification.hpp
new file mode 100644
index 000000000..3c76e4f10
--- /dev/null
+++ b/opm/core/ProductionSpecification.hpp
@@ -0,0 +1,52 @@
+#ifndef OPM_PRODUCTIONSPECIFICATION_HPP
+#define	OPM_PRODUCTIONSPECIFICATION_HPP
+
+namespace Opm {
+class ProductionSpecification {
+public:
+    enum Component {
+        GAS, OIL, WATER
+    };
+    
+    enum ControlMode {
+        NONE_CM, ORAT, WRAT, REIN, RESV, VREP, WGRA, FLD
+    };
+    
+    enum Procedure {
+        WELL, RATE, NONE_P
+    };
+    
+    ProductionSpecification();
+    virtual ~ProductionSpecification();
+    
+    
+    void set_BHP_target(double BHP_target_);
+    double get_BHP_target() const;
+    void set_liquid_production_target(double liquid_production_target_);
+    double get_liquid_production_target() const;
+    void set_water_production_target(double water_production_target_);
+    double get_water_production_target() const;
+    void set_oil_production_target(double oil_production_target_);
+    double get_oil_production_target() const;
+    void set_procedure(Procedure procedure_);
+    Procedure get_procedure() const;
+    void set_control_mode(ControlMode control_mode_);
+    ControlMode get_control_mode() const;
+    void set_component(Component component_);
+    Component get_component() const;
+private:
+    Component component_;
+    ControlMode control_mode_;
+    Procedure procedure_;
+
+    double oil_production_target_;
+    double water_production_target_;
+    double liquid_production_target_;
+    double BHP_target_;
+    
+    
+};
+}
+
+#endif	/* OPM_PRODUCTIONSPECIFICATION_HPP */
+
diff --git a/opm/core/WellsGroup.cpp b/opm/core/WellsGroup.cpp
new file mode 100644
index 000000000..3993d02ca
--- /dev/null
+++ b/opm/core/WellsGroup.cpp
@@ -0,0 +1,20 @@
+/* 
+ * File:   WellsGroup.cpp
+ * Author: kjetilo
+ * 
+ * Created on March 27, 2012, 9:27 AM
+ */
+
+#include "WellsGroup.hpp"
+namespace Opm {
+AbstractWellsGroup::AbstractWellsGroup() {
+}
+
+AbstractWellsGroup::~AbstractWellsGroup() {
+}
+
+const std::string& AbstractWellsGroup::get_name() {
+    return name_;
+}
+}
+}
\ No newline at end of file
diff --git a/opm/core/WellsGroup.hpp b/opm/core/WellsGroup.hpp
new file mode 100644
index 000000000..2d77cad9b
--- /dev/null
+++ b/opm/core/WellsGroup.hpp
@@ -0,0 +1,30 @@
+#ifndef OPM_WELLSGROUP_HPP
+#define	OPM_WELLSGROUP_HPP
+#include <opm/core/InjectionSpecification.hpp>
+#include <opm/core/ProductionSpecification.hpp>
+
+
+namespace Opm {
+class AbstractWellsGroup {
+public:
+    AbstractWellsGroup(const std::string& name);
+    virtual ~AbstractWellsGroup();
+    
+    const std::string& get_name();
+    const ProductionSpecification& get_production_specification() const;
+    const InjectionSpecification& get_injection_specification() const;
+    
+private:
+    std::string name_;
+    ProductionSpecification production_specification_;
+    InjectionSpecification injection_specification_;
+
+};
+
+class WellsGroup : public AbstractWellsGroup {
+    
+};
+
+}
+#endif	/* OPM_WELLSGROUP_HPP */
+