However a number of flaws emerged through the use of the updated Arrow scheme. When run properly, with the Cub Scouts choosing their activities, it was described even by the Scout Association later as an "organisational nightmare". It was easy for a Cub to lag behind in one section and extra time was often needed for Cubs to work on their particular activities. It was also possible for a Cub to choose an easy route through each award, missing out the more challenging activities and classic Scouting skills that made it very difficult for the leaders in the Scout troop to run their programme when Cubs moving up were not well versed in these skills. It was much less structured and the assessment for each award became subjective for the leader as the level of mastery required between bronze, silver and gold awards were very different. Subsequently Cub leaders, and occasionally entire districts, tried to make sense of the awards by imposing their own structure and variations and choosing the activities on behalf of the Cubs.