A method for quantitative and qualitative analysis of one or more complex template nucleic acids to be amplified in a sample, comprising the following steps: a) providing a reaction mixture comprising - the complex template nucleic acid to be amplified, - a specified amount of at least one control nucleic acid, wherein the control nucleic acid has less than 50% sequence identity to the template nucleic acid and wherein said control nucleic acid has at least one region of known sequence, - primers for amplifying the template nucleic acid, - primers for amplifying the control nucleic acid, - enzymes and reagents suited for the amplification of nucleic acids; b) co-amplification of the template nucleic acid and of the control nucleic acid, wherein the co-amplification takes place isothermally, wherein the co-amplification comprises a strand displacement reaction and wherein the template and control nucleic acids are essentially completely amplified in said amplification; c) quantification of the amplified control nucleic acid, wherein the quantification is performed after completion of the co-amplification of step b), wherein the total amount of nucleic acid is in addition quantified after completion of the co-amplification; wherein the primers for the amplification of the template nucleic acid and the control nucleic acid are identical; wherein the control nucleic acid is an exogenous nucleic acid; wherein the amount of the amplified control nucleic acid and the total amount of nucleic acid is correlated with an amplification of the complex template nucleic acid that has taken place; wherein the complex template nucleic acid comprises more than 10,000 nucleotides. a) providing a reaction mixture comprising - the complex template nucleic acid to be amplified, - a specified amount of at least one control nucleic acid, wherein the control nucleic acid has less than 50% sequence identity to the template nucleic acid and wherein said control nucleic acid has at least one region of known sequence, - primers for amplifying the template nucleic acid, - primers for amplifying the control nucleic acid, - enzymes and reagents suited for the amplification of nucleic acids; - the complex template nucleic acid to be amplified, - a specified amount of at least one control nucleic acid, wherein the control nucleic acid has less than 50% sequence identity to the template nucleic acid and wherein said control nucleic acid has at least one region of known sequence, - primers for amplifying the template nucleic acid, - primers for amplifying the control nucleic acid, - enzymes and reagents suited for the amplification of nucleic acids; b) co-amplification of the template nucleic acid and of the control nucleic acid, wherein the co-amplification takes place isothermally, wherein the co-amplification comprises a strand displacement reaction and wherein the template and control nucleic acids are essentially completely amplified in said amplification; c) quantification of the amplified control nucleic acid, wherein the quantification is performed after completion of the co-amplification of step b), wherein the total amount of nucleic acid is in addition quantified after completion of the co-amplification; wherein the primers for the amplification of the template nucleic acid and the control nucleic acid are identical; wherein the control nucleic acid is an exogenous nucleic acid; wherein the amount of the amplified control nucleic acid and the total amount of nucleic acid is correlated with an amplification of the complex template nucleic acid that has taken place; wherein the complex template nucleic acid comprises more than 10,000 nucleotides.