There are no limits on either. Very large numbers of resources or activities may require a higher subscription level, but there are no computational limits in the software or database. An activity may specify required resources by inserting wildcards for specific resource names. This means any resource of the same type is acceptable. In this case, the system will look at combinations of resources to find those that are feasible to schedule. Because excessive “wild carding” will lead to very large numbers of combinations to check, there is a practical limit on the number of combinations that are considered.