This training continues in subsequent career stages. Diagnosis in the early stages is difficult. There are no larval stages of development. This reform never progressed beyond the planning stages. Poor sleep quality disrupts the cycle of transition between the different stages of sleep. There are also plans for a sequel in the early stages of development. Development of all life stages depends on temperature. Water is essential in the early stages of preparation. Caterpillars mature through a series of developmental stages known as instars. Larvae progress through four distinct growth stages (instars). The battle consisted of four separate stages. The industrial management system developed in three distinct stages. Freud viewed libido as passing through a series of developmental stages within the individual. Within these were cells of six stages. The aircraft went through several alterations in each of its design stages and variants.