After the business requirements are identified and the fit-gap analysis is done, one important decision the project team has to make is whether to build the required customizations or buy an existing solution to bridge the solution gap. During the fit-gap analysis, you can use the LCS BPM libraries and add your requirements associated with the business process. You can specify whether the requirement is a fit or gap, and you can also specify a high-level estimation. You can then use the LCS BPM library to view all the processes and gaps to identify the areas that require ISV solutions.   

There are a great many ISV solutions available in the Dynamics 365 ecosystem that can help you bridge the gap between the standard product and the required industry-specific functionality. Usually, if someone already has a solution that has been used by multiple customers, it will be less risky than developing your own solution--you don't want to reinvent the wheel.

Solution architects and the technical and functional teams need to act as the customer's advocate in choosing ISV solutions. Getting the right ISV solution is important for your success.

The introduction of Microsoft AppSource has made it super easy to find the right ISV solution. As shown in the following image, simply visit https://appsource.microsoft.com, refine your search by category, industry, and product, and you'll get a list of ISV solutions available as per your criteria. You can sign up for a trial or contact the provider directly through the portal to get the process started: