The Tower and Trail Making subtests of the DKEFS are administered to children aged 8 years and above to measure planning and switching abilities respectively. The Tower Test involves building a tower to match a presented picture using five disks of different sizes arranged on three pegs. The child must build the tower in the fewest number of moves possible and as quickly as possible, moving only one disk at a time and without placing any disk on a smaller disk. There are a total of nine towers to build, with increasing time limits for each trial. The time of the first move, total time taken per trial, total number of rule violations and accuracy are recorded. Total achievement scores are converted to scaled scores (M = 10, SD = 3). 

The Trails subtest has five conditions: Visual Scanning, Number Sequencing, Letter Sequencing, Number-Letter Sequencing and Motor Speed. The visual scanning test requires children to cross out all the number threes on a response page of numbers and letters. Errors and time taken to complete the tasks are recorded. The Letter Sequencing and Number Sequencing subtests require children to connect letters in alphabetical order (A to P) or numbers in ascending order (numbers 1 to 16). The switching condition, Number-Letter Sequencing involves connecting letters and numbers in an alternating ascending sequence (e.g. A-1, B-2, C-3 etc). Motor speed involves tracing a dotted line to connect circles as quickly as possible.  For each condition, completion times are converted to scaled scores (M = 10, SD = 3). Note that the DKEFS subtests were not administered to the first 60 children attending the CALM clinic. 

Delis DC, Kaplan E, Krmaer JH. Delis-Kaplan executive function system. London, UK: Pearson; 2001.