
    Design a function for an adaptive learning platform that determines if a specific performance score exists in a student's historical achievement record and identifies when it occurred in their learning journey. The function should analyze the sequence of past performance scores and return both whether the target score exists and its chronological position in the student's history (or -1 if the score is not found).
    

    
def sequential_search(dlist, item):
    """
    Design a function for an adaptive learning platform that determines if a specific performance score exists in a student's historical achievement record and identifies when it occurred in their learning journey. The function should analyze the sequence of past performance scores and return both whether the target score exists and its chronological position in the student's history (or -1 if the score is not found).
    

    """
def sequential_search(dlist, item):
    """
    Design a function for an adaptive learning platform that determines if a specific performance score exists in a student's historical achievement record and identifies when it occurred in their learning journey. The function should analyze the sequence of past performance scores and return both whether the target score exists and its chronological position in the student's history (or -1 if the score is not found).
    

    """
    pos = 0
    found = False
    while pos < len(dlist) and (not found):
        if dlist[pos] == item:
            found = True
        else:
            pos = pos + 1
    return (found, pos)