Do you have a student with multiple sound errors? Are you unsure of where to start because there are so many sound errors and you have a difficult time understanding their speech? If you said yes to any of the above your student may be experiencing a phonological processing disorder.
Your student may have more than a simple articulation delay, such as struggling to produce the /r/ or /l/ sound.
They may actually have a phonological disorder which is when a student has not learned the rules for how sounds fit together in order to make words and in turn uses certain processes to simplify words.