You can analyze the amount of coattailing in your system by examining VTAM® tuning statistics. The tuning statistics indicate the total number of READ (CHRD or RCH) and WRITE (CHWR or WCH) channel programs that are used for data transfer operations. This information can be used to tune your system to improve coattailing if necessary. Increasing coattailing in your system can impact response times because coattailing means there are data transfer operations delays. When examining tuning statistics, also consider that short periods of high-attention counts can indicate a light load on the network.