Evolutionary aspects of a binary with M_d = 0.7 M_⊙, M_a = 0.85 M_⊙, and P_i = 2 hours, where the donor evolves into a WD, forming a double white dwarf system. The panels display the evolution of different parameters as in Fig. 2. The background colors yellow, and green represent the gravitational-wave inspiral phase (GW-inspiral), and mass transfer phase during the He shell burning phase (Shell-MT), respectively. This system is detached for most of its lifetime, and undergoes one episode of accretion that fails to ignite the He layer of the accretor, resulting in a double white dwarf. This double white dwarf is expected to merge in 86 million years which might lead to a Type Ia supernova.