As an AI, the Muse is restricted by a few limits, as described in the Core rulebook. They may not have an aptitude score higher than 20, they may not have an active skill higher than 40, they may not have a knowledge skill higher than 90, they do not gain rez and they do not have moxie. Outside of those rules, the AI in the Core rulebook are all made with the same CP rules that player characters are made with. Each cost tier (low, moderate, high, expensive) has an associated CP value that AI have. So an Expensive AI might have 400CP to spend when you are making it (might not actually be that). So, because we know both the limits of an AI, and the cost values that they are made with, you can easily house rule a module that allows you to improve your Muse. You know how much 1CP is worth in Credits (as per character creation), so you can even get a credit value for each improvement. For example, lets say I have a default Muse. I want to improve his SOM aptitude (which by default starts at 10) up to 20. I can go to the character creation section of the book on page 135 which has all the CP values written out clearly. Improving an aptitude by 10 would cost me 100CP during character creation. Every CP is worth 1,000 credits. Combining the two, you can clearly see that a Muse patch that improves its SOM aptitude up to 20 should cost at least 100,000 credits. So that would be an extremely expensive patch. Say that instead of improving my Muses SOM all the way to 20, I just want it to have a Freerunning skill of 40. It doesn't already know the Freerunning skill, so it starts at the Muses default SOM of 10. Improving it to 40 will cost me 30CP, or 30,000 credits. Much cheaper, but maybe not as efficient. Basically, take the CP cost of the upgrade you are wanting to do, and multiply it by 1000 to get the credit value. The AI in the Core rulebook are balanced to the core system, so they are very easily to modify. On how one might be improving their Muse, I would imagine it would all be handled by software plugins. You send a copy of your Muse off to its manufacturer, with a request to upgrade it to a particular ability. “I want my Muse to be firearms proficient, as capable with a rifle as an army grunt out of basic”. The manufacturer then custom writes (or applies a generic upgrade) a patch to your Muse which gets integrated into its skill set. They send the Muse back to you, you boot it up, and now your Muse can sit in your automated turret and keep the deck clear of pigeons for you. Edit: The values used for AI creation, in case you want to make your own from the ground up. Moderate = 150CP High = 300CP Expensive = 400CP All Aptitudes start at 10 All Aptitudes are limited to a rating of 20 All Active Skills are limited to a rating of 40 All Knowledge Skills are limited to a rating of 90 All CP Costs are equal to those for Character Creation