A definition method, for defining a load curve for a crane, the definition method comprising the steps: - simulating a crane comprising at least: ∘ i) one jib comprising a structure composed of several elements, and ∘ ii) one lifting member which is configured to lift a load and which is movable along the jib successively in several reaches, - selecting several elements to be tested, - for each element to be tested, selecting at least one respective predetermined maximum stress, - selecting several reaches along the jib, and - at each reach, carrying out the following analysis steps: • (112.1) choosing a theoretical load to be suspended from the lifting member, • (112.2) calculating stresses which are induced by the theoretical load in each element to be tested, • (112.3) for each element to be tested, comparing the calculated stresses with the respective predetermined maximum stresses, • (112.41) incrementing the theoretical load if at least one of the calculated stresses is less than a respective predetermined maximum stress, • (112.42) decrementing the theoretical load if at least one of the calculated stresses is greater than a respective predetermined maximum stress, • (112.5) repeating i) the calculation step (112.2) and ii) the comparison step (112.3) and one from iii) the incrementation step (112.41) and iii) the decrementation step (112.42) until finding the maximum theoretical load for which the calculated stresses are substantially equal to the respective predetermined maximum stresses, and • (112.6) storing in a memory a group of values comprising i) the reach and ii) the maximum theoretical load for which the calculated stresses are substantially equal to the respective predetermined maximum stresses. - simulating a crane comprising at least: ∘ i) one jib comprising a structure composed of several elements, and ∘ ii) one lifting member which is configured to lift a load and which is movable along the jib successively in several reaches, ∘ i) one jib comprising a structure composed of several elements, and ∘ ii) one lifting member which is configured to lift a load and which is movable along the jib successively in several reaches, - selecting several elements to be tested, - for each element to be tested, selecting at least one respective predetermined maximum stress, - selecting several reaches along the jib, and - at each reach, carrying out the following analysis steps: • (112.1) choosing a theoretical load to be suspended from the lifting member, • (112.2) calculating stresses which are induced by the theoretical load in each element to be tested, • (112.3) for each element to be tested, comparing the calculated stresses with the respective predetermined maximum stresses, • (112.41) incrementing the theoretical load if at least one of the calculated stresses is less than a respective predetermined maximum stress, • (112.42) decrementing the theoretical load if at least one of the calculated stresses is greater than a respective predetermined maximum stress, • (112.5) repeating i) the calculation step (112.2) and ii) the comparison step (112.3) and one from iii) the incrementation step (112.41) and iii) the decrementation step (112.42) until finding the maximum theoretical load for which the calculated stresses are substantially equal to the respective predetermined maximum stresses, and • (112.6) storing in a memory a group of values comprising i) the reach and ii) the maximum theoretical load for which the calculated stresses are substantially equal to the respective predetermined maximum stresses. • (112.1) choosing a theoretical load to be suspended from the lifting member, • (112.2) calculating stresses which are induced by the theoretical load in each element to be tested, • (112.3) for each element to be tested, comparing the calculated stresses with the respective predetermined maximum stresses, • (112.41) incrementing the theoretical load if at least one of the calculated stresses is less than a respective predetermined maximum stress, • (112.42) decrementing the theoretical load if at least one of the calculated stresses is greater than a respective predetermined maximum stress, • (112.5) repeating i) the calculation step (112.2) and ii) the comparison step (112.3) and one from iii) the incrementation step (112.41) and iii) the decrementation step (112.42) until finding the maximum theoretical load for which the calculated stresses are substantially equal to the respective predetermined maximum stresses, and • (112.6) storing in a memory a group of values comprising i) the reach and ii) the maximum theoretical load for which the calculated stresses are substantially equal to the respective predetermined maximum stresses.