Once you have finished charting Robert's speech data, compare your completed PPSA with the one shown here. Don't worry too much if there are one or two differences between them. However, if there are several differences, I recommend that you try to work out where you have gone wrong. You don't need to chart the full data set again, just look at those phonemes where you have something different. For example, if you have only noted 3 instances of word-initial /s/ realised as [d] (I've noted 5), look through the data set for words beginning with /s/ - you should find that there are five and, on each occasion, /s/ is realised as [d]. (If not let me know!! It is possible, though unlikely in this instance, that I have made a mistake.)
Usually errors reflect: (a) losing/failing to mark your place in the word list, (b) noting information in the wrong column. Ensure that the information entered in the first three columns aligns with information entered in the Errored Realisations and/or Deletions columns, e.g. if you have noted 5 dashes in the WI box for /s/ indicating that on 5 occasions word-initial /s/ was produced incorrectly, you need to make sure that there are 5 entries in the WI box/es for /s/ under Errored Realisations and/or Deletions.
Another common mistake at this early stage in charting relates to clusters - make sure you spot these and only note them on the clusters table, i.e. you don't need to enter information twice for clusters. You do, though, need to enter information about both clusters and singletons in words that contain clusters and singletons, e.g. spot - note the realisation of /sp/ on the cluster table and the realisation of /t/ on the singleton chart.
You will be getting lots of practice in charting in the next few weeks and will, I guarantee, get much faster!