DWS class can be used to distinguish each day based on working conditions.
Let say Working day, Half day working day,Weekly off and Public holiday few cases depends on the requirement we can use different DWS class for different shift Since few times based on shift employee will get different benefits same can be used to differentiate the shifts as well.
Counting classes can be used count the number of days few cases based on different PWS employer will provide different benefits such as Leave Quotas etc same can be used to handle those cases.
Regards
Venkatesh