Other simple software tools also provide very important information during the development phase.

  A spread sheet can be used for tracking different items:

• Sensor level cost tracking,
  A master sheet is divided into sub-sheets by sensor cost partitions
• Software cost tracking,
  Key software modules and resource allocation
• System level cost tracking,
  A master sheet is divided into sub-sheets by system cost partitions
• System level thermal budget tracking
• System weight budget tracking.