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Hi, i am trying to declare an sc_port from which i want to send a struct (ressource) between two different modules. I declared an interface and a channel to implements the send and receive interface methods but i am experiencing two errors. The first one is C2011 'class ' type redefinition, the second one is C2504 base class undefined. Now the Interface is very simple: //comm_interface.h class comm_send_interface : virtual public sc_interface { public: virtual bool send(ressource) = 0; // send a ressource virtual void reset() = 0; // empty ressource list }; class comm_recv_interface : virtual public sc_interface { public: virtual bool recv(ressource &) = 0; // receive a ressource }; The channel where i implement the methods looks like this: //comm_channel.h #include "comm_interface.h" class comm_channel : public sc_module, public comm_send_interface, public comm_recv_interface { private: ressource rdata[9]; int i; //sc_event send_event, recv_event; public: comm_channel(sc_module_name rc_channel) : sc_module(rc_channel), i(0) {} bool send(ressource r); // write bool recv(ressource & r); // read void reset(); //void register_port(sc_port_base & port_, const char * if_typename_); }; bool comm_channel :: send(ressource r) { if (i < 10) { rdata[i++] = r; //recv_event.notify(); return true; } //wait(send_event); return false; } bool comm_channel :: recv(ressource &r) { if (i > 0) { r = rdata[--i]; return true; //read_event.notify; } return false; } void comm_channel :: reset() { i = 0; } And here i declare the sc_port to send and receive the "ressource". #ifndef ROBOT__H #define ROBOT__H #include "systemc.h" #include "ressource.h" //interface #include "comm_interface.h" struct robot : sc_module { sc_port<comm_recv_interface> rinput; sc_port<comm_send_interface> routput; ressource r; void drill(); void insert(); void tight(); SC_CTOR(robot) { //... }; #endif // ROBOT__H Can you help me with the Problem?! Thanks in advanced!