For fine-tuning the WFs two aspects are considered. First, the intradomain distribution of the WFs and second, their inter-domain balancing. The former concentrates on the distribution of the WFs values for one property independently from the other properties -for example assigning values for every ω MM i without concerning the values for ω MD j (see equation ). The latter takes the balance between the overall weights of the target properties from different domains (i.e. i ω MM i vs. j ω MD j ) into account. Herein four approaches for the intra-domain weight balancing are presented: "uniformly distributed WFs", "linearly decreasing WFs", "exponentially decreasing WFs" and "stepwise decreasing WFs" (see figure ), which are discussed in the following sections alongside the inter-domain balancing approach.